1. When creating a new version of a document, I'd like to use a version
control process rather than create newer file names for the same document.
Today, I create newer file names (e.g. Spreadsheet 12-20-04 1030am.xls,
Spreadsheet 12-21-04.xls) to track different versions. Is there a more
effective way to do this using Excel (or Word, for Word data files)?

2. Now that I have created multiple versions through different data file
names, how do I "diff" compare the different file names to ensure no
important data is lost prior to deleting prior versions?

Thank you.