Under some circumstances, such as a network error, the user's terminal can be disconnected from its associated address space. In this situation a user can be reconnected to the existing address space by using the RECONNECT parameter in the LOGON request.
TSO initially ignores the RECONNECT parameter and selects an unused ACB to process the initial logon. The original ACB is still disconnected. After the user's identity is validated, the newly selected ACB attempts to pass the session back to the original ACB.
If you specified SHR in the Type field in the ACT, it is possible to get another user's address space.
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