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Tip and Trick Detail
_Pkser - Undocumented System Variable\Command - Part 2
*Applies to: AutoCAD R12, 13, 14, 2000, 2000i, 2002, 2004 and 2005*

The undocumented System Variable named _PKSER holds the serial number for the AutoCAD session that is making the call for the value.  _PKSER will also work as a command if typed in at the command line.  The value that is returned is read-only and can't be changed.

Command Line:
Command: _pkser
_PKSER = "339-XXXXXXXX" (read only)

See Also:
Click here to download the listing of all the system variables