If you don't have access to the standard coldfusion administrator and the server monitor in there, then you are unlikely to be able to use FusionReactor or SeeFusion
What you might be able to use is CFtracker in standalone mode, as you should be able to drop this into a folder on your server and get access to it immediately. It should will give you a good idea of what is going on with memory usage, session and application data and so on.
If you do have access to install applications on your server, then its definitely worth looking at FusionReactor and SeeFusion free trials to see which will give you the information you need.
Also, don't forget that looking through the webserver, JRun and ColdFusion server instance logs will also provide valuable information on what is going on on your server and application.