Lexmark J110 Reference Manual page 206

%LPR_B%
%LPR_C%
%LPR_D%
%UnknownDevice%
This operator is equivalent to executing the following PostScript emulation
sequence:
currentsystemparams /CurInputDevice get
Error: stackoverflow
jobtimeout
queries the current user default setting for the JobTimeout parameter. An
integer is returned on the stack:
disabled
seconds
This operator is equivalent to executing the following PostScript emulation
sequence:
currentuserparams /JobTimeout get
Error: stackoverflow
manualfeed
See page 4-17.
4-39
PostScript