Unmanaged dll argument

If you're trying to call a function in an unmanaged dll from C# or VB.NET using 'platform invoke' (i.e. DllImport attribute), then the following site contains signatures and (if you're lucky) sample code for most Win32 and some other dlls:

http://www.pinvoke.net/

If the dll you want to use is not listed and you don't have any documentation for it, then the free tool, Dependency Walker, may be able to help:

http://www.dependencywalker.com/