NAME
        UserState -- return to user state with user stack

   SYNOPSIS
        UserState(sysStack)
                  D0

        void UserState(APTR);

   FUNCTION
        Return to user state with user stack, from supervisor state with
        user stack.  This function is normally used in conjunction with the
        superstate function above.

        This function must not be called from the user state.

   INPUT
        sysStack - supervisor stack pointer

   BUGS
        This function is broken in V33/34 Kickstart.  Fixed in V1.31 setpatch.

   SEE ALSO
        superstate(), supervisor()