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