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If no specific LU name is provided on the MAILOGON command, MAI-OC generates one consisting of the MAIOPREF prefix (set by the LU1 Terminal Prefix field of the EXTAPPLPOOLS parameter group in Customizer) followed by a number in the range 001 - 999. The number chosen is the first that is not already in use by another MAI-OC session.
This technique lets you establish an MAI-OC session without knowing the identity of the terminal that MAI-OC will simulate. It also implies that when the session is established, the LU name used by MAI-OC is unpredictable.
When an MAILOGON request without a specified LU name fails because MAI has chosen an unknown LU name, MAI tries up to five successive LU names (each beginning with the MAIOPREF prefix) before indicating that no MAI-OC LUs are available. This is because a defined MAI-OC LU may have been varied inactive; therefore, appears to MAI the same as an LU that has not been defined.
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