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Submit is a perl script that is basically an AFS ACL Access Control List and directory tree administratormanager. It requires no special operating system privs to run, and as such, will only give away as much access to your account as you allow it. If you are more interested in what/how it does what it does, please feel free to view the script (all the functions of the program are contained in a single script), or assign it to your students as an excercise exercise to improve 
Additional Reading (OpenAFS Documentation)
Setting Up Your Account
The behaviour behavior of the system is controlled by a file called .submitrc located in your home directory. The file is structured into multiple CLASS groups, each of which can contain specific information for each class the account is set up to receive submissions for, and one or more PROJECT groups, which contain information specific to each project. Do NOT use an editor that uses CR/LF line terminators (like Microsoft's Notepad) or CR only (like Apple's Macintosh) – stick with any of the Unix editors.
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