Logged In: NO

There is a field like "URL_common_strings", which are replaced
by short tokens in the search database.

If the config file used during the dig specifies your.host.edu as
on of these, and the config file used during searching replaces
this with other.host.com then all URLs which referred to
your.host.edu will automatically be returned as if they had
contained other.host.com

I hope this helps