SET lets you do the following:

PAP LMTS - is CADKEY shorthand for paper limits. PAP LMTS
           is a toggle that lets you turn the highlighted
           paper border on and off.

           The shortcut for PAP LMTS is (Alt)-(K). 

           If CADKEY displays the paper border and you 
           choose PAP LMTS, the border disappears. If the
           paper border border does not appear and you 
           choose PAP LMTS, the border reappears.

SHOW NEW - highlights any dimensions that CADKEY
           automatically updated and all instance-specific
           entities that you've modified or created since
           the last time you worked on that layout. 

           SHOWNEW is a toggle that lets you turn the
           highlighting on and off. 

           CADKEY highlights any of the entities that you
           modified or created in Model Mode as dashed,
           highlighted lines. To turn the highlighting
           off, either choose SHOWNEW again or redraw the
           screen.

SHOW INST- highlights all instance-specific geometry in 
           the current layout. This helps you distinguish
           between layout-specific and instance-specific 
           geometry if you get confused. 

           The shortcut for SHOWINST is (Alt)-(C).

           CADKEY highlights all instance-specific 
           geometry in the current layout as dashed,
           highlighted lines. To turn the highlighting
           off, redraw the screen.
