Although MediaWiki has a good history facility, it would be great if the text in a page were flagged to indicate changes since the last time that page was viewed. This could range from revision bars in the margin to marking adds/changes/deletes similar to Word change tracking. Are old versions of a page saved by MediaWiki or are only the changes recorded for the revision history? Also, does MediaWiki record (a) when a user last logged in or (b) when a user last viewed a page? Thanks, Norbert