Lexmark Optra T Reference page 213

%LPR_B%
%LPR_C%
%LPR_D%
%UnknownDevice%
This operator is equivalent to executing the following PostScript emulation
sequence:
currentsystemparams /CurInputDevice get
Error: stackoverflow
jobtimeout
— jobtimeout integer
queries the current user default setting for the JobTimeout parameter. An
integer is returned on the stack:
disabled
0
seconds
15...65355
This operator is equivalent to executing the following PostScript emulation
sequence:
currentuserparams /JobTimeout get
Error: stackoverflow
manualfeed
See page 4-23.
4-45
PostScript