oSpy is a tool which aids in reverse-engineering software running on the Windows platform. With the amount of proprietary systems that exist today (synchronization protocols, instant messaging, etc.), the amount of work required to keep up when developing interoperable solutions will quickly become a big burden when limited to traditional techniques. However, when the sniffing is done on the API level it allows a much more fine-grained view of what's going on. Seeing return-addresses for each recv/send call (for example), can prove useful when you want to look at the processing code at that spot in a debugger or static analysis tool. And if an application uses encrypted communication it's easy to intercept these calls as well. oSpy already intercepts one such API, and is the API used by MS