>have your process first check to see if the process 
>is done already. If it is, then don't do it.

Seconded.

Log the start time, stop time, and a random identifier each time a process runs.
(Can either store these in a shared scope, or in a file, depending on what 
process does and what makes most sense for your application)

These three values then allow you to take different actions if the process has 
recently been run (or is still running)...

For example just display an alert and stop, or redirect back to form, or 
display an 'in progress' and meta-refresh after X seconds, or display the 
previous data, and so on... 

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