{
{ The purpose of this procedure is to verify that a portion of a segment
{ specified by <pva> to <pva>+<length> exists in real memory.
{
{      MMP$CHECK_IF_PAGES_IN_MEMORY (PVA, LENGTH, IN_MEMORY)
{
{ PVA: (input) This parameter specifies the beginning address of the
{      pages the caller wishes to check.
{
{ LENGTH: (input) This parameter specifies the number of bytes to be checked.
{
{ IN_MEMORY: (output) This parameter specifies whether the pages exist in
{      real memory (TRUE), or do not exist in real memory (FALSE).
{
