TortoiseHG has built-in URLs to link to other changesets.
Is there a URI scheme to use these from a web browser? Something like hg://cset:tip?
That way you could have a clickable link from the web browser straight to the changeset you need…
Alternatively, how hard would it be to implement something like this, for Chrome, Firefox, and IE?
The problem with using TortoiseHg for this is that the helpdesk people would need the repo on their machines.
If your Mercurial repositories are held on a central server and you use
hgwebthen you already have this feature available to you. You can go tohttp://hg.server/path/to/repo/rev/71745da8b9b3to view changeset71745da8b9b3on a particular repository for example.