Jim Tcl
Help: /wdiff
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The "/wdiff" page:

Show the changes to a wiki page.

Query parameters:

id=HASH
Hash prefix for the child version to be diffed.
rid=INTEGER
RecordID for the child version
pid=HASH
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.