>We need to put a VFP6 application on WAN and I never did it before.
>What is the difference between having VFP application on LAN and WAN??
>What do I need to watch for???
>Any articles about it???

A WAN will generally be slower than a LAN. If you can test out your application on the WAN to see if you get acceptable performance. If the link is too slow you will need to think about client/server (one alternative).

With a database server like SQL Server or Oracle you can control (and thus reduce) what data gets sent back and forth from the database server to the client computer. Take a look at: http://www.vitus.com/vfpcs.html