how to change standard J2EE port 50000 to port 80?

We have the WAS 6.40 sneak preview installation. We have successfully tested the sample calculator jsp application, but would like to get standard apps running on port 80 for network security reasons. Where in the config do we change it to listen on http port 80 instead of 50000?

And, since this is only a sneak preview app w/J2EE, am I to assume that there is no access to the system via standard SAP GUI for Windows? I haven't seen anything in the documentation about being able to access the system this way.