A List of all the AutoCAD System variables and their meanings.

ACADLSPASDOC	Controls whether AutoCAD loads the acad.lsp file into every drawing or just the first drawing opened in an AutoCAD session.
ACADPREFIX	Stores the directory path, if any, specified by the ACAD environment variable, with path separators appended if necessary.
ACADVER	Stores the AutoCAD version number.
ACISOUTVER	Controls the ACIS version of SAT files created using the ACISOUT command.
AFLAGS	Sets attribute flags for ATTDEF bit-code.
ANGBASE	Sets the base angle 0 with respect to the current UCS.
ANGDIR	Sets the positive angle direction from angle 0 with respect to the current UCS.
APBOX	Turns the AutoSnap aperture box on or off.
APERTURE	Sets object snap target height, in pixels.
AREA	Stores the last area computed by AREA, LIST, or DBLIST.
ATTDIA	Controls whether -INSERT uses a dialog box for attribute value entry.
ATTMODE	Controls display of attributes.
ATTREQ	Determines whether INSERT uses default attribute settings during insertion of blocks.
AUDITCTL	Controls whether AUDIT creates an audit report (ADT) file.
AUNITS	Sets units for angles.
AUPREC	Sets the number of decimal places for angular units.
AUTOSNAP	Controls AutoSnap marker, tooltip, and magnet.
BACKZ	Stores the back clipping plane offset from the target plane for the current viewport.
BINDTYPE	Controls how xref names are handled when binding xrefs or editing xrefs in-place.
BLIPMODE	Controls whether marker blips are visible.
CDATE	Sets calendar date and time.
CECOLOR	Sets the color of new objects.
CELTSCALE	Sets the current object linetype scaling factor.
CELTYPE	Sets the linetype of new objects.
CELWEIGHT	Sets the lineweight of new objects.
CHAMFERA	Sets the first chamfer distance.
CHAMFERB	Sets the second chamfer distance.
CHAMFERC	Sets the chamfer length.
CHAMFERD	Sets the chamfer angle.
CHAMMODE	Sets the input method by which AutoCAD creates chamfers.
CIRCLERAD	Sets the default circle radius.
CLAYER	Sets the current layer.
CMDACTIVE	Stores the bit-code that indicates whether an ordinary command, transparent command, script, or dialog box is active.
CMDECHO	Controls whether AutoCAD echoes prompts and input during the AutoLISP (command) function.
CMDNAMES	Displays the names of the active and transparent commands.
CMLJUST	Specifies multiline justification.
CMLSCALE	Controls the overall width of a multiline.
CMLSTYLE	Sets the multiline style.
COMPASS	Controls whether the 3D compass is on or off in the current viewport.
COORDS	Controls when coordinates are updated on the status line.
CPLOTSTYLE	Controls the current plot style for new objects.
CPROFILE	Stores the name of the current profile.
CTAB	Returns the name of the current (model or layout) tab in the drawing. Provides a means for the user to determine which tab is active.
CURSORSIZE	Determines the size of the crosshairs as a percentage of the screen size.
CVPORT	Sets the identification number of the current viewport.
DATE	Stores the current date and time.
DBMOD	Indicates the drawing modification status using bit-code.
DCTCUST	Displays the path and file name of the current custom spelling dictionary.
DCTMAIN	Displays the file name of the current main spelling dictionary.
DEFLPLSTYLE	Specifies the default plot style for new layers.
DEFPLSTYLE	Specifies the default plot style for new objects.
DELOBJ	Controls whether objects used to create other objects are retained or deleted from the drawing database.
DEMANDLOAD	Specifies if and when AutoCAD demand loads a third-party application if a drawing contains custom objects created in that application.
DIASTAT	Stores the exit method of the most recently used dialog box.
DIMADEC	Controls the number of places of precision displayed for angular dimensions.
DIMALT	Controls the display of alternate units in dimensions.
DIMALTD	Controls the number of decimal places in alternate units.
DIMALTF	Controls the multiplier for alternate units.
DIMALTRND	Determines rounding of alternate units.
DIMALTTD	Sets the number of decimal places for the tolerance values in the alternate units of a dimension.
DIMALTTZ	Toggles suppression of zeros in tolerance values.
DIMALTU	Sets the units format for alternate units of all dimension style family members except angular.
DIMALTZ	Controls the suppression of zeros for alternate unit dimension values.
DIMAPOST	Specifies a text prefix or suffix (or both) to the alternate dimension measurement for all types of dimensions except angular.
DIMASO	Controls the associativity of dimension objects.
DIMASZ	Controls the size of dimension line and leader line arrowheads.
DIMATFIT	Determines how dimension text and arrows are arranged when space is not sufficient to place both within the extension lines.
DIMAUNIT	Sets the units format for angular dimensions.
DIMAZIN	Suppresses zeros for angular dimensions.
DIMBLK	Sets the arrowhead block displayed at the ends of dimension lines or leader lines.
DIMBLK1	Sets the arrowhead for the first end of the dimension line when DIMSAH is on.
DIMBLK2	Sets the arrowhead for the second end of the dimension line when DIMSAH is on.
DIMCEN	Controls drawing of circle or arc center marks and centerlines by DIMCENTER, DIMDIAMETER, and DIMRADIUS.
DIMCLRD	Assigns colors to dimension lines, arrowheads, and dimension leader lines.
DIMCLRE	Assigns colors to dimension extension lines.
DIMCLRT	Assigns colors to dimension text.
DIMDEC	Sets the number of decimal places displayed for the primary units of a dimension.
DIMDLE	Sets the distance the dimension line extends beyond the extension line when oblique strokes are drawn instead of arrowheads.
DIMDLI	Controls the spacing of dimension lines in baseline dimensions.
DIMDSEP	Specifies a single character decimal separator to use when creating dimensions whose unit format is decimal.
DIMEXE	Specifies how far to extend the extension line beyond the dimension line.
DIMEXO	Specifies how far extension lines are offset from origin points.
DIMFIT	Obsolete. Replaced by DIMATFIT and DIMTMOVE.
DIMFRAC	Sets the fraction format when DIMLUNIT is set to 4 or 5.
DIMGAP	Sets the distance around the dimension text when the dimension line breaks to accommodate dimension text.
DIMJUST	Controls the horizontal positioning of dimension text.
DIMLDRBLK	Specifies the arrow type for leaders.
DIMLFAC	Sets a scale factor for linear dimension measurements.
DIMLIM	Generates dimension limits as the default text.
DIMLUNIT	Sets units for all dimension types except Angular.
DIMLWD	Assigns lineweight to dimension lines.
DIMLWE	Assigns lineweight to extension lines.
DIMPOST	Specifies a text prefix or suffix (or both) to the dimension measurement.
DIMRND	Rounds all dimensioning distances to the specified value.
DIMSAH	Controls the display of dimension line arrowhead blocks.
DIMSCALE	Sets the overall scale factor applied to dimensioning variables that specify sizes, distances, or offsets.
DIMSD1	Controls suppression of the first dimension line.
DIMSD2	Controls suppression of the second dimension line.
DIMSE1	Suppresses display of the first extension line.
DIMSE2	Suppresses display of the second extension line.
DIMSHO	Controls redefinition of dimension objects while dragging.
DIMSOXD	Suppresses drawing of dimension lines outside the extension lines.
DIMSTYLE	Shows the current dimension style.
DIMTAD	Controls the vertical position of text in relation to the dimension line.
DIMTDEC	Sets the number of decimal places to display in tolerance values for the primary units in a dimension.
DIMTFAC	Sets a scale factor used to calculate the height of text for dimension fractions and tolerances.
DIMTIH	Controls the position of dimension text inside the extension lines for all dimension types except ordinate.
DIMTIX	Draws text between extension lines.
DIMTM	When DIMTOL or DIMLIM is on, sets the minimum (or lower) tolerance limit for dimension text.
DIMTMOVE	Sets dimension text movement rules.
DIMTOFL	Controls whether a dimension line is drawn between the extension lines even when the text is placed outside.
DIMTOH	Controls the position of dimension text outside the extension lines.
DIMTOL	Appends tolerances to dimension text.
DIMTOLJ	Sets the vertical justification for tolerance values relative to the nominal dimension text.
DIMTP	When DIMTOL or DIMLIM is on, sets the maximum (or upper) tolerance limit for dimension text.
DIMTSZ	Specifies the size of oblique strokes drawn instead of arrowheads for linear, radius, and diameter dimensioning.
DIMTVP	Controls the vertical position of dimension text above or below the dimension line.
DIMTXSTY	Specifies the text style of the dimension.
DIMTXT	Specifies the height of dimension text, unless the current text style has a fixed height.
DIMTZIN	Controls the suppression of zeros in tolerance values.
DIMUNIT	Obsolete. Replaced by DIMLUNIT and DIMFRAC.
DIMUPT	Controls options for user-positioned text.
DIMZIN	Controls the suppression of zeroes in the primary unit value.
DISPSILH	Controls display of silhouette curves of solid objects in Wireframe mode.
DISTANCE	Stores the distance computed by DIST.
DONUTID	Sets the default for the inside diameter of a donut.
DONUTOD	Sets the default for the outside diameter of a donut.
DRAGMODE	Controls the display of objects being dragged.
DRAGP1	Sets the regen-drag input sampling rate.
DRAGP2	Sets the fast-drag input sampling rate.
DWGCHECK	Determines whether a drawing was last edited by a product other than AutoCAD.
DWGCODEPAGE	Stores the same value as SYSCODEPAGE (for compatibility reasons).
DWGNAME	Stores the drawing name as entered by the user.
DWGPREFIX	Stores the drive/directory prefix for the drawing.
DWGTITLED	Indicates whether the current drawing has been named.
EDGEMODE	Controls how TRIM and EXTEND determine cutting and boundary edges.
ELEVATION	Stores the current elevation relative to the current UCS for the current viewport in the current space.
EXPERT	Controls whether certain prompts are issued.
EXPLMODE	Controls whether EXPLODE supports non-uniformly scaled (NUS) blocks.
EXTMAX	Stores the upper-right point of the drawing extents.
EXTMIN	Stores the lower-left point of the drawing extents.
EXTNAMES	Sets the parameters for named object names (such as linetypes and layers) stored in symbol tables.
FACETRATIO	Controls the aspect ratio of faceting for cylindrical and conic ACIS solids.
FACETRES	Adjusts the smoothness of shaded and rendered objects and objects with hidden lines removed.
FILEDIA	Suppresses display of the file dialog boxes.
FILLETRAD	Stores the current fillet radius.
FILLMODE	Specifies whether multilines, traces, solids, all hatches (including solid-fill), and wide polylines are filled in.
FONTALT	Specifies the alternate font to be used when the specified font file cannot be located.
FONTMAP	Specifies the font mapping file to be used.
FRONTZ	Stores the front clipping plane offset from the target plane for the current viewport.
FULLOPEN	Indicates whether the current drawing is partially open.
GRIDMODE	Specifies whether the grid is turned on or off.
GRIDUNIT	Specifies the grid spacing (X and Y) for the current viewport.
GRIPBLOCK	Controls the assignment of grips in blocks.
GRIPCOLOR	Controls the color of non-selected grips (drawn as box outlines).
GRIPHOT	Controls the color of selected grips (drawn as filled boxes).
GRIPS	Controls the use of selection set grips for the Stretch, Move, Rotate, Scale, and Mirror grip modes.
GRIPSIZE	Sets the size of the grip box in pixels.
HANDLES	Reports whether object handles can be accessed by applications.
HIDEPRECISION	Controls the accuracy of hides and shades.
HIGHLIGHT	Controls object highlighting; does not affect objects selected with grips.
HPANG	Specifies the hatch pattern angle.
HPBOUND	Controls the object type created by BHATCH and BOUNDARY.
HPDOUBLE	Specifies hatch pattern doubling for user-defined patterns.
HPNAME	Sets a default hatch pattern name.
HPSCALE	Specifies the hatch pattern scale factor.
HPSPACE	Specifies the hatch pattern line spacing for user-defined simple patterns.
HYPERLINKBASE	Specifies the path used for all relative hyperlinks in the drawing.
IMAGEHLT	Controls whether the entire raster image or only the raster image frame is hightlighted.
INDEXCTL	Controls whether layer and spatial indexes are created and saved in drawing files.
INETLOCATION	Stores the Internet location used by BROWSER and the Browse the Web dialog box.
INSBASE	Stores insertion base point set by BASE.
INSNAME	Sets a default block name for INSERT.
INSUNITS	When you drag a block from AutoCAD DesignCenter, specifies a drawing units value.
INSUNITSDEFSOURCE	Sets source content units value.
INSUNITSDEFTARGET	Sets target drawing units value.
ISAVEBAK	Improves the speed of incremental saves, especially for large drawings.
ISAVEPERCENT	Determines the amount of wasted space tolerated in a drawing file.
ISOLINES	Specifies the number of isolines per surface on objects.
LASTANGLE	Stores the end angle of the last arc entered.
LASTPOINT	Stores the last point entered.
LASTPROMPT	Stores the last string echoed to the command line.
LENSLENGTH	Stores the length of the lens (in millimeters) used in perspective viewing for the current viewport.
LIMCHECK	Controls the creation of objects outside the drawing limits.
LIMMAX	Stores the upper-right drawing limits for the current space.
LIMMIN	Stores the lower-left drawing limits for the current space.
LISPINIT	When single-document interface is enabled, specifies whether AutoLISP-defined functions and variables are preserved when you open a new drawing.
LOCALE	Displays the ISO language code of the current AutoCAD version.
LOGFILEMODE	Specifies whether the contents of the text window are written to a log file.
LOGFILENAME	Specifies the path and name of the log file.
LOGFILEPATH	Specifies the path for the log files for all drawings in a session.
LOGINNAME	Displays the user's name as configured or as input when AutoCAD is loaded.
LTSCALE	Sets the global linetype scale factor.
LUNITS	Sets linear units.
LUPREC	Sets the number of decimal places displayed for linear units.
LWDEFAULT	Sets the value for the default lineweight.
LWDISPLAY	Controls whether the lineweight is displayed in the Model or Layout tab.
LWUNITS	Controls whether lineweight units are displayed in inches or millimeters.
MAXACTVP	Sets the maximum number of viewports that can be active at one time in the display.
MAXSORT	Sets the maximum number of symbol names or block names sorted by listing commands.
MBUTTONPAN	Controls the behavior of the third button or wheel on the pointing device.
MEASUREINIT	Sets the initial drawing units as English or metric.
MEASUREMENT	Sets drawing units as English or metric for the current drawing only.
MENUCTL	Controls the page switching of the screen menu.
MENUECHO	Sets menu echo and prompt control bits.
MENUNAME	Stores the menu file name, including the path for the filename.
MIRRTEXT	Controls how MIRROR reflects text.
MODEMACRO	Displays a text string on the status line.
MTEXTED	Sets the primary and secondary text editors to use for multiline text objects.
NOMUTT	Suppresses the message display (muttering) when it wouldn't normally be suppressed.
OFFSETDIST	Sets the default offset distance.
OFFSETGAPTYPE	Controls how to offset polylines when a gap is created as a result of offsetting the individual polyline segments.
OLEHIDE	Controls the display of OLE objects in AutoCAD.
OLEQUALITY	Controls the default quality level for embedded OLE objects.
OLESTARTUP	Controls whether the source application of an embedded OLE object loads when plotting.
ORTHOMODE	Constrains cursor movement to the perpendicular.
OSMODE	Sets running object snap modes using bitcodes.
OSNAPCOORD	Controls whether coordinates entered on the command line override running object snaps.
PAPERUPDATE	Controls the display of a warning dialog when attempting to print a layout with a paper size different from the paper size specified by the default for the plotter configuration file.
PDMODE	Controls how point objects are displayed.
PDSIZE	Sets the display size for point objects.
PERIMETER	Stores the last perimeter value computed by AREA, LIST, or DBLIST.
PFACEVMAX	Sets the maximum number of vertices per face.
PICKADD	Controls whether subsequent selections replace the current selection set or add to it.
PICKAUTO	Controls automatic windowing at the Select Objects prompt.
PICKBOX	Sets object selection target height.
PICKDRAG	Controls the method of drawing a selection window.
PICKFIRST	Controls whether you select objects before or after you issue a command.
PICKSTYLE	Controls the use of group selection and associative hatch selection.
PLATFORM	Indicates which platform of AutoCAD is in use.
PLINEGEN	Sets how linetype patterns generate around the vertices of a 2D polyline.
PLINETYPE	Specifies whether AutoCAD uses optimized 2D polylines.
PLINEWID	Stores the default polyline width.
PLOTID	Obsolete, has no effect except to preserve the integrity of pre-AutoCAD 2000 scripts and LISP routines.
PLOTROTMODE	Controls the orientation of plots.
PLOTTER	Obsolete. Has no effect except to preserve the integrity of pre-AutoCAD 2000 scripts and LISP routines.
PLQUIET	Controls the display of optional dialog boxes and nonfatal errors for batch plotting and scripts.
POLARADDANG	Contains user-defined polar angles.
POLARANG	Sets the polar angle increment.
POLARDIST	Sets the snap increment when the SNAPSTYL system variable is set to 1 (polar snap).
POLARMODE	Controls settings for polar and object snap tracking.
POLYSIDES	Sets the default number of sides for POLYGON.
POPUPS	Displays the status of the currently configured display driver.
PRODUCT	Returns the product name.
PROGRAM	Returns the program name.
PROJECTNAME	Assigns a project name to the current drawing.
PROJMODE	Sets the current Projection mode for trimming or extending.
PROXYGRAPHICS	Specifies whether images of proxy objects are saved in the drawing.
PROXYNOTICE	Displays a notice when you open a drawing containing custom objects created by an application that is not present.
PROXYSHOW	Controls the display of proxy objects in a drawing.
PSLTSCALE	Controls paper space linetype scaling.
PSPROLOG	Assigns a name for a prolog section to be read from the acad.psf file when you are using PSOUT.
PSQUALITY	Controls the rendering quality of PostScript images.
PSTYLEMODE	Indicates whether the current drawing is in a Color-Dependent or Named Plot Style mode.
PSTYLEPOLICY	Controls whether an object's color property is associated with its plot style.
PSVPSCALE	Sets the view scale factor for all newly created viewports.
PUCSBASE	Stores the name of the UCS that defines the origin and orientation of orthographic UCS settings in paper space only.
QTEXTMODE	Controls how text is displayed.
RASTERPREVIEW	Controls whether BMP preview images are saved with the drawing.
REFEDITNAME	Indicates whether a drawing is in a reference-editing state and stores the reference file name.
REGENMODE	Controls automatic regeneration of the drawing.
RE-INIT	Reinitializes the digitizer, digitizer port, and acad.pgp file.
RTDISPLAY	Controls the display of raster images during Realtime ZOOM or PAN.
SAVEFILE	Stores the current auto-save file name.
SAVEFILEPATH	Specifies the path to the directory for all automatic save files for the AutoCAD session.
SAVENAME	Stores the file name and directory path of the current drawing after you save it.
SAVETIME	Sets the automatic save interval, in minutes.
SCREENBOXES	Stores the number of boxes in the screen menu area of the drawing area.
SCREENMODE	Stores a bitcode indicating the graphics/text state of the AutoCAD display.
SCREENSIZE	Stores current viewport size in pixels (X and Y).
SDI	Controls whether AutoCAD runs in single- or multiple-document interface.
SHADEDGE	Controls the shading of edges in rendering.
SHADEDIF	Sets the ratio of diffuse reflective light to ambient light.
SHORTCUTMENU	Controls whether Default, Edit, and Command mode shortcut menus are available in the drawing area.
SHPNAME	Sets a default shape name.
SKETCHINC	Sets the record increment for SKETCH.
SKPOLY	Determines whether SKETCH generates lines or polylines.
SNAPANG	Sets snap and grid rotation angle for the current viewport.
SNAPBASE	Sets the snap and grid origin point for the current viewport relative to the current UCS.
SNAPISOPAIR	Controls the isometric plane for the current viewport.
SNAPMODE	Turns Snap mode on and off.
SNAPSTYL	Sets snap style for the current viewport.
SNAPTYPE	Sets the snap style for the current viewport.
SNAPUNIT	Sets the snap spacing for the current viewport.
SOLIDCHECK	Turns the solid validation on and off for the current AutoCAD session.
SORTENTS	Controls the OPTIONS command (from the Selection tab) object sort order operations.
SPLFRAME	Controls the display of splines and spline-fit polylines.
SPLINESEGS	Sets the number of line segments to be generated for each spline-fit polyline.
SPLINETYPE	Sets the type of curve generated by the Spline option of the PEDIT command.
SURFTAB1	Sets the number of tabulations to be generated for RULESURF and TABSURF.
SURFTAB2	Sets the mesh density in the N direction for REVSURF and EDGESURF.
SURFTYPE	Controls the type of surface-fitting to be performed by the Smooth option of the PEDIT command.
SURFU	Sets the surface density for PEDIT Smooth in the M direction.
SURFV	Sets the surface density for PEDIT Smooth in the N direction.
SYSCODEPAGE	Indicates the system code page specified in acad.xmf.
TABMODE	Controls the use of the tablet.
TARGET	Stores the location of the target point for the current viewport.
TDCREATE	Stores the local time and date the drawing was created.
TDINDWG	Stores the total editing time.
TDUCREATE	Stores the universal time and date the drawing was created.
TDUPDATE	Stores the local time and date of the last update/save.
TDUSRTIMER	Stores the user-elapsed timer.
TDUUPDATE	Stores the universal time and date of the last update/save.
TEMPPREFIX	Contains the directory name for temporary files.
TEXTEVAL	Controls the method of evaluation for text strings.
TEXTFILL	Controls the filling of TrueType fonts while plotting, exporting with the PSOUT command, and rendering.
TEXTQLTY	Sets the resolution tesselation fineness of text outlines for TrueType fonts while plotting, exporting with the PSOUT command, and rendering.
TEXTSIZE	Sets the default height for new text objects drawn with the current text style.
TEXTSTYLE	Sets the name of the current text style.
THICKNESS	Sets the current 3D solid thickness.
TILEMODE	Makes the Model tab or the last layout tab current.
TOOLTIPS	Controls the display of tooltips.
TRACEWID	Sets the default trace width.
TRACKPATH	Controls the display of polar and object snap tracking alignment paths.
TREEDEPTH	Specifies the maximum depth, that is, the number of times the tree-structured spatial index can divide into branches.
TREEMAX	Limits memory consumption during drawing regeneration by limiting the number of nodes in the spatial index (oct-tree).
TRIMMODE	Controls whether AutoCAD trims selected edges for chamfers and fillets.
TSPACEFAC	Controls the multiline text line spacing distance measured as a factor of text height.
TSPACETYPE	Controls the type of line spacing used in multiline text.
TSTACKALIGN	Controls the vertical alignment of stacked text.
TSTACKSIZE	Controls the percentage of stacked text fraction height relative to selected text’s current height.
UCSAXISANG	Stores the default angle when rotating the UCS around one of its axes using the X, Y, or Z options of the UCS command.
UCSBASE	Stores the name of the UCS that defines the origin and orientation of orthographic UCS settings.
UCSFOLLOW	Generates a plan view whenever you change from one UCS to another.
UCSICON	Displays the UCS icon for the current viewport.
UCSNAME	Stores the name of the current coordinate system for the current viewport in the current space.
UCSORG	Stores the origin point of the current coordinate system for the current viewport in the current space.
UCSORTHO	Determines whether the related orthographic UCS setting is restored automatically when an orthographic view is restored.
UCSVIEW	Determines whether the current UCS is saved with a named view.
UCSVP	Determines whether the UCS in active viewports remains fixed or changes to reflect the UCS of the currently active viewport.
UCSXDIR	Stores the X direction of the current UCS for the current viewport in the current space.
UCSYDIR	Stores the Y direction of the current UCS for the current viewport in the current space.
UNDOCTL	Stores a bitcode indicating the state of the Auto and Control options of the UNDO command.
UNDOMARKS	Stores the number of marks that have been placed in the UNDO control stream by the Mark option.
UNITMODE	Controls the display format for units.
USERI1–5	Stores and retrieves integer values.
USERR1–5	Stores and retrieves real numbers.
USERS1–5	Stores and retrieves text string data.
VIEWCTR	Stores the center of view in the current viewport.
VIEWDIR	Stores the viewing direction in the current viewport.
VIEWMODE	Controls the View mode for the current viewport using bitcode.
VIEWSIZE	Stores the height of the view in the current viewport.
VIEWTWIST	Stores the view twist angle for the current viewport.
VISRETAIN	Controls the visibility, color, linetype, lineweight, and plot styles (if PSTYLEPOLICY is set to 0) of xref-dependent layers and specifies whether nested xref path changes are saved.
VSMAX	Stores the upper-right corner of the current viewport's virtual screen.
VSMIN	Stores the lower-left corner of the current viewport’s virtual screen.
WHIPARC	Controls whether the display of circles and arcs is smooth.
WMFBKGND	Controls the background of the output Windows metafile resulting from the WMFOUT command, and for the metafile format of objects placed on the Clipboard or dragged and dropped into other applications.
WORLDUCS	Indicates whether the UCS is the same as the WCS.
WORLDVIEW	Determines whether input to the 3DORBIT, DVIEW, and VPOINT commands is relative to the WCS (default), the current UCS, or the UCS specified by the UCSBASE system variable.
WRITESTAT	Indicates whether a drawing file is read-only or can be written to, for developers who need to determine write status through AutoLISP.
XCLIPFRAME	Controls the visibility of xref clipping boundaries.
XEDIT	Controls whether the current drawing can be edited in-place when being referenced by another drawing.
XFADECTL	Controls the fading intensity for references being edited in-place.
XLOADCTL	Turns xref demand loading on and off and controls whether it opens the original drawing or a copy.
XLOADPATH	Creates a path for storing temporary copies of demand-loaded xref files.
XREFCTL	Controls whether AutoCAD writes external reference log (XLG) files.
ZOOMFACTOR	Controls the incremental change in zoom with each IntelliMouse wheel action, whether forward or backward.

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