Some facility sub-options behave differently in IMS than they do in other facility types.
Depending upon the startup parameters set in the IMS control region, users may be restricted to signon only at a single static terminal. In this case, setting a TSS facility SIGN(M) sub-option to allow a single ACID to signon at multiple IMS terminals has no effect.
ETO terminals which employ a DFSUSER descriptor at signon are automatically restricted to single signons. Initialization parameters and customization exits for IMS can be used to alter the signon descriptor, and allow multiple signons for ETO terminals. However, some IMS application op-codes (for example CHNG) perform security INIT using the descriptor as an ACID. In these cases, the administrator is responsible to assure that such ACIDs exist, and are capable of signon to the associated region. SIGN(M) may be used in such cases.
Normally, LUMSG and STMSG govern the issuance of the messages TSS7001I and TSS7000I respectively.
When only one of these facility options is enabled, only one line of message is generated for a successful signon. This has the effect of releasing a successful signon message in format DFSMO1 rather than the usual DFSMO2.
When both of these options are disabled, the response to a successful signon is to release message DFS3650I on format DFSMO2, displaying both user and node information. This occurs whether the end user is signed onto a static terminal or an ETO terminal.
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