Some system variables included into VFP for backward compatibility. They may need to be included into the configuration file.
Try 'set margin to' instead.

>>>>>>>>>>>>>>your message below
How does one control the left margin for printing? I can't get _Ploffset, or set margin to work.

Here's my code:
_ploffset=15
SET PRINT ON
set printer font "Courier" Style "Normal"
? "Some text"
set print off
set print to

What am I missing?