NUMPRINTER()
 Returns the number of parallel ports
------------------------------------------------------------------------------
 Syntax

     NUMPRINTER() --> 1.04nNumber

 Returns

     NUMPRINTER() returns the number of parallel printer interfaces installed
     on the machine.

 Description

     Once you establish that multiple printer ports are installed, choose
     which printer wants to use (e.g., dot-matrix or laser printer).
     NUMPRINTER() also detects if a printer is not installed over the usual
     printer interface, because there is no port available.

 Note

     .  This function cannot determine if a printer is connected and
        ready to operate.

 Example

     Determine if a printer interface is available:

     ?  "There are " + STR(NUMPRINTER(), 2) + " Printer ports"
     ?? "available"