The LIB/CCF system also provides a control mechanism called a Change Request. Each change request for a problem or modification is assigned a change request ID when initiated. All LIB/CCF functions that must be performed to complete this change, such as login and logout, are associated with this change request. Therefore, a LIB/CCF system master file is also required for storing these change requests. Whenever a member is logged out, a Module Tracking Record is created for it.
This record exists until the member is logged in. The Module Tracking Record control member is also stored in this LIB/CCF system master file. It contains an entry for every member that was logged out.
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