Hi,
We would like to set up an account with a limited, captive environment. Basically we want the account to run an application when a user logs into it, and limit the user to only interacting with the application program.
Create a file in the user's home directory called ~/.Xclients and in it put
#!/bin/sh metacity & /path/to/your/program
Then run
chmod +x ~/.Xclients
--Ray Strode