Introduction Printer Functions
 NUMPRINTER() Returns the number of parallel ports
 PRINTFILE()  Prints out ASCII files; clears high bits
 PRINTINIT()  Initializes one of the printers
 PRINTREADY() Determines if a particular printer is ready
 PRINTSCR()   Prints screen contents
 PRINTSCRX()  Prints screen contents while it exchanges specific characters
 PRINTSEND()  Sends characters directly to a printer
 PRINTSTAT()  Determines the status of a parallel port
 SPOOLACTIV() Determines if the DOS PRINT program is installed
 SPOOLADD()   Appends a file to the print queue.
 SPOOLCOUNT() Determines the number of entries in the print spool queue
 SPOOLDEL()   Deletes files from the print queue
 SPOOLENTRY() Determines the name and path of a print job
 SPOOLFLUSH() Completely empty the print queue
 TOF()        Determines if CA-Clipper is at top of form (TOF)