DOS / Interrupts / Int 2F / 4B/05


                   TASK SWITCHING - Identify Instance Data

Input	DOS1	N	DOS2	N	DOS3	N	DOS5	Y	Output
AX	4Bh		05h						AX
									BX
									CX
CX:DX	Service Function Handler								DX
ES:BX	0				Addr of SWSTARTUPINFO, 0=None				ES:BX

SWSTARTUPINFO:

        WORD    Version
        DWORD   Previous handlers SWSTARTUPINFO
        DWORD   Ignored
        DWORD   Ignored
        DWORD   SWINSTANCEITEM structure address