if they have a simple setup with a computer and router...find the ip address from the computer you want to pull from and just go:
Start -> Run -> \\ip address (like \\192.168.1.110)
When the window opens you will find the folder your looking for (it will be shared); All you need to do is right click and create a shortcut to your desktop - so the end result is you have to log in and click on the icon...
FYI - You will have two IP's one will be the server address which is assigned by the network the router is attached to (like comcast, ITCdelta, Bellsouth,etc.) and you will have the IP address the computer (you want to pull from) gets from the router - thats the one that goes into the run box.
-> if its a small office and in house IT, then make sure that the computer you want to pull from has a static IP address in the router. This will save time and make things simple.