Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Offline
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Filesystem will automatically lock files from write if they're already open. You can't override this remotely though so if someone opens it in the shop and goes home, you're stuck with read only unless you can get to the other computer.
Better solution may be remote desktop to the computer where the files are.
You don't technically need a VPN, just port forward the router to the machine you want to remote desktop in to so that port 3389 goes to that local IP address.
You need static IP on the shop internet connection as well.
If you want it more secure then a VPN is a better solution but lots more messing. The Netgear DG834 will support it if you have recent firmware. Anything after version 2.10.22.
I also wouldn't recommend trying to share files over a wireless link. The important stuff that you need to get to should be wired to ensure its always available. Wireless, particularly in a workshop with loads of metal all over the place won't be fantastic and if you're not there you can't twiddle.
Good luck 
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