There was a document in EDN, which now is lost, named “Useful shortcuts and urls for documentum D2”, and one of the URLs was an autologin url, quite useful for development purposes. The url shown was the following one:
D2/?_docbase=<repository>&_username=<username>&_password=<password>
However, although this works fine in D2-Config, it doesn’t work in D2 (>4.2, AFAIK) and this seems to be the case as there are several posts that seem related to this “issue”.
Well, the truth is that there’s still a way to autologin in D2:
D2/?docbase=<repository>&login=<username>&password=<password>
Alvaro de Andres' Blog 
This doesn’t seem to work with D2 4.7 and Chrome.
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Actually, it does work but only once: after logout it stops working because D2 sets afterLogout=true cookie
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As Andrey said, when you click logout it stops working. Maybe you can use some cookie management extension to delete the cookie… I haven’t looked for a workaround for that
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