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Access to the ABCD Website is restricted to members of the Harvard Community, and others on an individual basis. Access without a password is granted to machines with registered hostnames in the and domains. All others will need to enter an ABCD username and password to gain access to the members' areas.

For most users, this means that when you are on a Harvard network, you won't need to supply a password, and when you are off campus you will. Note, however, that it is possible to be on a Harvard network without a registered DNS hostname. In this case, it is impossible for us to determine whether your system is on a Harvard network or not, so you will need to provide your username and password.

If you have any problems with access, please contact us at

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last updated: Mon Mar 9 14:27:31 2015 Copyright 2015 by the President and Fellows of Harvard College