{
{   The purpose of this request is to establish a debug critical frame
{ in an interrupted user program.  An established debug critical frame
{ will give a debugger control on return from or pop of a user's procedure
{ for which a debug critical frame is established.
{
{   Attempts to establish a debug critical frame for an invalid stack
{ frame save area are in error.
{
{       PMP$ESTABLISH_DEBUG_CFF (CRITICAL_FRAME, STATUS)
{
{ CRITICAL_FRAME: (input) This parameter specifies the critical stack
{       frame save area for establishment of the debug critical frame.
{
{ STATUS: (output) This parameter specifies the request status.
{      CONDITIONS:
{            pme$inconsistent_stack
{            pme$stack_frame_not_found
{
