INT 2F CU - MS Windows WINOLDAP - SWITCHING ??? AX = 4601h Return: ??? Note: the DOS 5+ kernel intercepts this function and copies the MCBsee Memory Control Block following the caller's PSPsee Program Segment Prefix memory block into the DOS data segment; in conjunction with AX=4602h, this intercept is used by DOS to avoid corruption of the Windows real-mode heap's end sentinel SeeAlso: AX=1700h,AX=4602h