INT 21 - PCMag PCMANAGE/DCOMPRES - INSTALLATION CHECK                           
	AX = FEDCh
Return: AX = CDEFh if installed
Program: the PCMANAGE/DCOMPRES combination from PCIBM PC Magazine permits
	  infrequently-used files to be compressed to save space and
	  transparently expanded when accessed
SeeAlso: AH=DCh,INT 2D/AL=10h"dLite"