No, it doesn't need to be checked in. It works for checked out and checked in files. But the file must be in VSS.

Vlad

>Do they have to be checked in? PVCS had/has a pretty decent diff tool that could just work on two input files. It was pretty good at finding moved code too.
>
>>VSS gives GREAT diff for ASCII text files. Check in a file, then check in the second file under the same name, and select the Diff report. It works well with any number of ASCII flavors, but it doesn't do anything for you if you have binary or Unicode files.