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It needs to go directly to Site A but must update a record on Site B simultaneously. The goal is to not have it access Site B before Site A in order to update the record.
I would think it would be an onunload event when the page leaves to A it would somehow send a message to Site B.
Thanks for the ideas!
For example, the web stats package I wrote inserts an IFRAME on the page which calls the tracking software on my server. The IFRAME is set to zero size, hidden etc etc.
If I need to debug, I make the IFRAME visible and it actually contains useful information about what it's tracking.
This is the same method page counters and things use, I imagine it's the industry standard way of doing it.