>I have an ASP application communicating with a VFP 8 DLL over the internet via IIS.
>
>A potentail Client has asked me:
>What is the maximum number of simultaneous requests that can be processed in this way without causing a problem. The server is P4, 2400 with 4GB running Windows 2000 Server.
>
>I need a realistic answer/guess if you have one.
>Please - No answers like - you will need to test it to find out.

You will need to test it to find out.

Really, it all depends on the length of time and the amount of processing your VFP dll is going to consume. If your app just returns the "Hello World" message then you can have many more simultaneous requests than if the app needs to do, for example, a complex report.