DOS / Interrupts / Int 2F / 4B/01


                  TASK SWITCHING - Build Notification Chain

Input	DOS1	N	DOS2	N	DOS3	N	DOS5	Y	Output
AX	4Bh		01h						AX
									BX
									CX
CX:DX	Service Function Handler Addr								DX
ES:BX	0				Address of SWCALLBACKINFO, 0=None				ES:BX

SWCALLBACKINFO:

        DWORD   Address of next SWCALLBACKINFO
        DWORD   Address of Notification Function Handler
        DWORD   Reserved
        DWORD   Address of SWAPINFO structure