INT 2F - WinDOS v2.11 - SET XMSsee Extended Memory Specification IDENTIFICATION VALUE
	AX = AF12h
	DS = new XMSsee Extended Memory Specification identification value (normally caller's PSPsee Program Segment Prefix segment)
Return: nothing
SeeAlso: AX=AF00h"WinDOS",AX=AF11h"WinDOS"