SwSrvc Fn 0003H: Resume Switcher

 Expects: AX    0003H
          ES:DI address of calling switcher's service function handler
 Returns: CF    Carry Flag is clear (NC) is successful
                CF is set (CY) if the switcher does not support this fn.
    Info: This service is used ONLY by a task-switching program that has
          previously suspended another task switcher.

          Applications should not use this service.  If you need to keep a
          switcher from suspending a session, you should hook into the
          notification chain (via SwNtfyFn 0004H) and handle SwNtfyFn 0001H
          (query suspend) calls.

See Also: Switcher Services and Notifications
          INT 2fH 4bxxH (switcher functions)