{ This request returns the segment number and maximum segment length of the
{ stack segment for the ring number specified by the caller.  It sets the
{ stack segment length to zero if requested.  This request is available in
{ Monitor Mode only.
{
{    MMP$FETCH_STACK_SEGMENT_INFO (XCB_P, RING, SET_LENGTH, SEGNUM,
{          LENGTH, FOUND);
{
{ XCB_P: (input) This parameter specifies a pointer to the execution control
{       block of the task.  The task must be swapped in.
{
{ RING: (input) This parameter specifies the ring number of the stack.
{
{ SET_LENGTH: (input) This parameter specifies whether or not to set the
{       length of the stack to zero.
{
{ SEGNUM: (output) This parameter returns the segment number for the stack
{       segment of the specified ring.
{
{ LENGTH: (output) This parameter returns the maximum size allowed for the
{       stack.
{
{ FOUND: (output) This parameter returns whether or not the stack was
{       found.
{

