Network file locking

Hi all,

I have written an Autoit script to generate reports and keep a list of 
the 10 most recent reports in an ini file.

Now the need arrises that more than one of these programs runs on a 
network and they should all update the same ini file (or another 
solution that has the same result)

I dont want to run the risk of multiple programs writing at the same 
time trashing the file or the contents of the list

There doesn't seem to be a way to lock a file in autoit, does anyone 
have a good solution?

Thanks in advance
Peter van Hoof