DOS / Interrupts / Int 2F / 4B/04


                      TASK SWITCHING - Free Switcher ID

Input	DOS1	N	DOS2	N	DOS3	N	DOS5	Y	Output
AX	4Bh		04h						AX
BX	Identifier				0=OK, else Invalid Identifier				BX
CX									CX
DX									DX
ES:DI	Service Handler Address								CF