Lexmark T630n VE Reference Manual page 245

duplexmode
— duplexmode boolean
queries the current value for the Duplex page device parameter.
true
printing mode is duplex
false
printing mode is simplex
Note: For printers that do not support duplexing, this value is always
This operator is equivalent to executing the following PostScript emulation
sequence:
currentpagedevice /Duplex get
Error: stackoverflow
enginesync
— enginesync boolean
indicates if the printer waits for the last page of a job to print before returning a
Ctrl-D to the host computer.
Error: stackoverflow
4-39
PostScript
false
.