API function OpenPrinter retrieves a handle to a printer using its name

DECLARE INTEGER OpenPrinter IN winspool.drv;
	STRING pPrinterName, INTEGER @phPrinter,;
	INTEGER pDefault

API function SetPrinter with PRINTER_CONTROL_PURGE parameter deletes all printer jobs.

DECLARE INTEGER SetPrinter IN winspool.drv;
	INTEGER hPrinter, LONG lvl,;
	INTEGER pPrinter, LONG cmd

API function SetJob pauses, resumes, cancels, or restarts a print job on a specified printer.

DECLARE INTEGER SetJob IN winspool.drv;
	INTEGER hPrinter, INTEGER JobId, INTEGER lvl,;
	INTEGER pJob, INTEGER cmd

FoxPro code samples (members area):

How to delete all print jobs for a printer
http://www.news2news.com/vfp/?example=370

Simple printer queue monitor: deletes, pauses, resumes print jobs for local printer
http://www.news2news.com/vfp/?example=373&function=544