{    This request returns information about various mainframe attributes.
{
{       PMH$GET_MAINFRAME_ATTRIBUTES (MAINFRAME_ATTRIBUTES, STATUS)
{
{ MAINFRAME_ATTRIBUTES: (input, output)  This parameter specifies the mainframe
{       attributes to get via setting the key field of the array elements to
{       designate the desired attribute.  The attribute values are returned in
{       the corresponding array elements.
{
{ STATUS: (OUTPUT)  This parameter specifies the standard status parameter.
{      CONDITION:
{          pme$invalid_attribute_key.
