[mwittman]

This would be an interesting chaining of technologies -- and I imagine a workflow of at least 3 major steps would be involved:

1. Library card reader stores each swipe event in a fashion that is export-able (either via the reader's embedded computer OR a linked general purpose computing platform -- I don't know)
2. A "cron" job exports the swipe data and transfers it to a server accessible by a computer with a RE client installed.
3. RE client computer has a scheduled task that runs a custom RE-API based program that parses the export file (from the server share) and adds an attribute to each RE Constituent record.

Working with the abilities/limitations of the card reader may be the first step of investigation.