Remove apls in the systray @ startup

I have about a half dozen of unnecessary applications which load at startup in the systray. I am running NT4 service pack5. The aplications are not being called from the Profiles/Startup directory. I believe they might be called from a registry entry. For example I have Realplayer StartCenter being loaded and I can not figure out where it is being called. That is just one Apl I wish to remove.

Any ideas?

gdesantis