http://www.mono-project.com/Main_Page
On that site, what is the difference between to two blocks to the left? They read.
Mono
An open source, cross-platform, implementation of C# and the CLR that is binary compatible with Microsoft.NET
MonoDevelop
An open Source C# and .NET development environment for Linux, Windows, and Mac OS X
Secondly, is there a way to download Mono on a Windows machine that runs in the background without also downloading the C# IDE?
One more thing. If I were to write a program on Linux with and for Mono, wouldn't that program also work on Windows & Mac providing they also had Mono installed? Thanks.