Help: /wdiff
Bounty program for improvements to Tcl and certain Tcl packages.

The "/wdiff" page:

Show the changes to a wiki page.

Query parameters:

Hash prefix for the child version to be diffed.
RecordID for the child version
Hash prefix for the parent.

The "id" query parameter is required. "pid" is optional. If "pid" is omitted, then the diff is against the first parent of the child.