?? LEFT := 1, RIGHT := 110 ??

{   Reserved Service Access Points (SAPs) include:
{     1. the range of dedicated XNS internet SAPs 0 - 999,
{     2. the range of CDNA reserved transport SAPs 1000 - 1999, and
{     3. the range of reserved SAPs supported at the external interface 2000 - 3000.

{   Dedicated SAPs
  CONST
    nac$xi_xerox_routing_sap = 1,
    nac$xi_xerox_echo_sap = 2,
    nac$xi_xerox_error_sap = 3,
    nac$xi_cdna_directory_sap = 20;

{   Dependent ME reserved transport SAPs are defined to be the following internet dedicated SAP
{   values plus a fixed offset of 1000.
  CONST
    nac$xi_cdna_file_access_sap = 21,
    nac$xi_cdna_command_sap = 22,
    nac$xi_cdna_log_sap = 23,
    nac$transport_sap_offset = 1000;

  CONST
    nac$maximum_reserved_sap_id = 3000;

