To avoid repeated hits on my database, I'd like to use a single access,
from which I can create a list of all the records of a particular type
which already exist.

I'd then have to store the identifiers of all these existing records as
the members of an associative array, but I'd have to be able to copy
this array's members to a Session Variable.

Is this possible?

Can I do

rec['A']['B'] = true;
rec['C']['D'] = true;