Lexmark X644e Betriebsanweisung

— userdiskpercent 

returns a 

 (zero) on the stack.

Errors: stackoverflow, invalidaccess

— waittimeout 

queries the current value for the WaitTimeout user parameter. An integer is 
returned on the stack:

disabled

 seconds

This operator is equivalent to executing the following PostScript emulation 
sequence:

currentuserparams /WaitTimeout get

Error: stackoverflow