in reply to
Tying Complex Data Structures using dbmfilters
Perhaps DBM::Deep is the module you're looking for since it describes itself as A pure perl multi-level hash/array DBM, and rather conveniently has a tie interface.
DBM::Deep is pure-Perl, so installation issues do not apply. You just need to copy the source somewhere accessible.
Makeshifts last the longest.
The same name on every site (unless it is taken already)
A different name for every site
The same name for sites I don't care about, but different names on sites I do care about
Different names for sites I don't care about, but the same name on sites I do care about
The anonymous account
Someone else's username
Root, after hacking into the site
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