INT 2F - Phar Lap DOS EXTENDERS - INSTALLATION CHECK                            
	AX = ED00h
	BL = DOS extender ID (see #03110)
Return: AL = status
	    00h not installed
	    FFh installed
		SI = 5048h ("PH")
		DI = 4152h ("AR")
		CH = major version number
		CL = minor version number
		DX = flags
		    bit 0: running under DPMIsee DOS Protected-Mode Interface
		    bit 1: running under Phar Lap VMM
		if running under DPMIsee DOS Protected-Mode Interface:
		    BX = DPMIsee DOS Protected-Mode Interface version (BH = major, BL = minor)
SeeAlso: AH=A1h,AX=F100h,AX=FBA1h


(Table 03110)
Values for Phar Lap DOS extender ID:
 01h	286dosx v1.3+ (Software Development Kit)
 02h	286dosx v1.3+ (Run-Time Kit)
 03h	386dosx v4.0+ (SDK)
 04h	386dosx v4.0+ (RTK)