> interested in just grabbing the new/updated tiddler and adding it to
> the TW in the browser so user doesn't have to reload just to see a
> single/few tiddlers updated.

http://www.TiddlyTools.com/#LoadTiddlersPlugin

The <<loadTiddlers ...>> macro reads local and remote TW documents,
and then imports tiddlers into the current document based on selective
criteria.

For your purposes, something like this should do:
  <<loadTiddlers "label:get updates" {{document.location.href}}
quiet>>

at it's center, load tiddlers uses the TW core API loadFile() for
local I/O and doHttp() for remote I/O (ajax) to get the file content
with which to create a *temporary store* object to extract the
tiddlers by invoking the core's importTiddlyWiki() method.

Note that LoadTiddlersPlugin can also detect NON-TiddlyWiki files
containing plain text, in which case the entire file is imported as a
single tiddler, or CSV-formatted data (generated by Excel, for
example) that defines tiddlers, one per row.

There should be plenty of example code for you to study....

enjoy,
-e

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