INT 2F - SETDRVER.COM v2.10+ - INSTALLATION CHECK                               
	AX = E000h
Return: AX = 4A52h ("JR") if present
Program: SETDRVER is a public domain TSR(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user.  The name comes from the name of the DOS function call used to remain in memory after termination. by Jacob Rieper which sets the
	  apparent DOS version analogously to MS-DOS SETVER
Notes:	this installation check differs from the usual one of returning AL=FFh
	the SETDRVER API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. is fully emulated by Matthias Paul's FREEVER
SeeAlso: AX=E000h/DX=4D50h,AX=E001h,INT 21/AH=52h