This option causes the EZTYP print file preview utility (aka EZVUE) to use the customizable SBX routine, EZPRTX, in place of its own logic for printing of a selected range of pages. This allows more sophisticated or application-specific printing logic to be used in place of the generic logic within EZTYP. For example, you may want to use different printer selection logic, or add logic to embed printer control codes into the selected pages to be printed. The source code to a generic sample version of EZPRTX.SBX is included in EZPRTX.SAM in [7,376]. Use it as the basis for your own customized version. There are additional notes in the source code about parameters and other technical details.