The following table provides summary descriptions of the AutoLISP device access functions.
Device access functions  | 
                  |
|---|---|
Function  | 
                     Description  | 
                  
(grread [track] [allkeys [curtype]])  | 
                     Reads values from any of the AutoCAD input devices  | 
                  
(tablet code [row1 row2 row3 direction])  | 
                     Retrieves and sets digitizer (tablet) calibrations  |