Controling data access

[iNovice]

I'm new here, so please forgive my double post. I will try again and hope that I'm descriptive enough so that it makes sense.

I would like to control access to data either by way of the found set, or controling the printing of a found set utilizing some sort of key.

I have 2 tables. 1 table, (business table), displays alot of static data, a primary key serial number ID tied to a specific business, and some other business information fields. The other table, (Prospect table), holds the mailing list data to be merged with the business table.

I would like to control the access to the mailing list merge data by some sort of key to unlock a predetermined number of records with predetermined zip codes, and then revert back to secure after retrieving the found set or printing the found set.

Any ideas?

[iNovice]

As a followup question, is there any Filemaker Guru's here that would know whether this is outside Filemakers capabilities?