Quick question about Web Protocol Handlers

I've started playing with the Web Protocol Handlers to see how we might use them in integrating RDM into other monitoring or documentation systems we have in place. As a start, I'd like to be able to link straight into a session, with the focus on the Documentation tab of that session, without actually opening the session.

I started with the automatically generated URL's, such as:

rdm://open?DataSource=457FE0D1-6774-457A-9FB4-EC1B86BA0656&Session=8a179c05-b01d-4ee2-a6f9-51ee5bd56ce2

That works, but opens the session. Next, I edited to do:

rdm://action?DataSource=457FE0D1-6774-457A-9FB4-EC1B86BA0656&Session=8a179c05-b01d-4ee2-a6f9-51ee5bd56ce2&Tabpage=Documentation

That launches RDM, but doesn't bring up the relevant session or focus on the Documentation tab. I'm thinking there must be other action words to use beyond open? or action? to do what I'm trying to do, but I'm not seeing it in the documentation for Web Protocol Handlers.

Is this something I can do?

Thanks,

Andrew