If as Mark has already stated, there is no way to provide information on procedures as to when they were last accessed, you may want to opt for your own logging file that is updated every time a procedure is called.

You can do this either with a trigger in each stored procedure or within your source code.

It is not a perfect solution but it does work as I tend to implement an error log with every application I build so if a user runs into a problem, resolutions can be developed far more quickly than if such information was not available...

Steve Naidamast