This example displays the 10 digits with the default margin and then sets the margin to column 10 and displays the 10 digits this time indented:

set printer on
set margin to 0 // The default
? "1234567890"
set margin to 10
? "1234567890"
? _ploffset
set margin to 0 // reset margin
set printer off
close printer

Produces:

// this displays as:
// 1234567890
// 1234567890
// 10
//
// _ploffset is set by set margin