INT 2F - DOS v5.0 TASK SWITCHER - FREE SWITCHER ID
AX = 4B04h
BX = switcher ID
ES:DI -> task switcher entry point (see AX=4B02h)
Return: AX = 0000h
BX = status
0000h successful
other error (invalid ID or ID not allocated)
Notes:  called by a task switcher when it exits, unless it was the first loaded
and is providing the support for AX=4B03h and AX=4B04h
the task switcher providing the identifiers may call the terminating
task switcher's entry point as needed
this call is available from within DOSSHELL even if the task switcher
is not installed
SeeAlso: AX=4B03h

See also: 2F4B02

2F4B04 - DOS v5.0 TASK SWITCHER - FREE SWITCHER ID