If you think you need to add a new user, then search by CRSid. Clicking on "add new user" in the search results will bring up the "Add new user" dialogue, prefilled with information available in Lookup.

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If you think you need to add a new student, then search by CRSid. Clicking on "add student" in the search results will bring up the "Add new student" dialogue, prefilled with information available in Lookup.

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Search by USN
Active users only

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You have probably been logged of the TiS out while your machine was asleep, or your Blue AD login may have expired. If you just click on "login" at the top of the page, in most cases you will be taken to the page you requested.