Compatibility: 5.0+

Expects: AX    4B02H  (INT 2fH)

BX    0000H (must be 0)

ES    0000H (must be 0)

Returns: AX    0000H if task switcher is installed

ES:BX address of service-function handler (if switcher installed)

0000:0000 if switched is not installed

Info: This determines whether a task switcher has been installed and

obtains the service function address (used for accessing switcher

services).

It is possible that more than one task switcher is active (for

instance, if DOSSHELL is executed while in a Windows command

prompt session).  To see if that's the case, use SwSrvcFn 0000H

and examine the pfPrevSwitcher field of the SwVersionRec

structure returned by that call.

Task switchers that intercept this call can enable interrupts can

use any DOS fns.

See Also: INT 2fH 4BxxH: Task Switcher Functions

Switcher Services and Notifications

INT 2fH: Multiplex Interrupt

DOS Functions

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