How do I source a field in another data access page?

I have a link on a data access page that opens another data access page.
I want a field in the "pop-up" data access page to have the same value as a
field in the main page.
Example.

Main Page:

Account: 12345
Information.....
Pop-up link

Account: 54321
Information.....
Pop-up link

Pop-up data access page:

Account: 12345
Different Information.....

Account: 54321
Different Information

I want the pop-up data access page to pull up the account number from the
main page where the link is located. If I click on the link under account
12345, I want the pop-up to have that same account number. If I click on the
link under account 54321, I want the pop-up page to use that account number.
In other words, is there a way to source fields from other data access pages?
In forms you can use DLookup, but what can you use in data access pages?
Please help!!!!!
Thanks.