INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET REFERENCE                     
	AL = 51h
	BL = reference ("bookmark") number
	CX:DX = new address for reference
Return: AL = status
	    00h invalid index
	    FFh reference set
Note:	this function is only available if the extended 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. has been installed
	  in the resident portion
Program: DTown Utilities is a shareware programmer's utility 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 Jeroen van
	  Disseldorp
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h