This parameter is used to define the user record for the host subsystem to which you are connecting. The user record is required when the target GCOS8 site has a "Secure Workstation Environment", or is using the ID-CHECK package developed by Bull Norway for securing networks.
In some situations the LID is generated by combining the value of this parameter with the local mailbox name. The method being used for generating the LID is determined by the -GRID and -NGRID parameters in the Datanet configuration.
When communicating with GCOS7 hosts the string !NEW may be used, which will force GCOS7 to start the dialogue by presenting the top level menu. Normally it would have tried to reconnect at the level you aborted in the previous host session.