Can't verify simple install.

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NT 4.0 EE SP6a, IIS 4.0 JRun 2.3 I let the install run as normal.  I had to go to the IIS web setup and associate .jrun with the jrun.dll in the IIS_ROOT\scripts directory (the jrun.dll was already there).   Now I'm a little confused as to which exact directory my servlets should be in for me to run them and why they aren't coming up.  There are several "samples" already set up in JRun\servlets, but none of them come up.  I try www.myserver.com/servlets/SimpleServlet, www.myserver.com/servlets/SimpleServlet.JRun, www.myserver.com/SimpleServlet etc... but I can't get anything to come up.  I've even compiled a simple "HelloWorld" and stuck it in just about every "servlets" directory I've found under JRun, but no combination of URL brings it up.  I'm always getting HTTP 404 - File not found   What's wrong?  What directory should I be putting the compiled servlets in?  If I have a servlet there, what would prevent it from coming up correctly?   Thanks!