URL Parameter using notes:// protocol

We have an app that is using pass-thru html in the Notes Client building a dynamic table. We want to add a column to the table that will allow users to add the documents to a favorites list. The problem is how to pass a parameter to a notes:// url.

After reading a post, it seems as though an option might be to call an ?OpenForm and then try to run an agent from the Post Open event. But again, we need to pass a variable to the agent.

Anyone have any ideas?