Hi Mat,
 

> What control do we have over a TW *via the browsers URL field?*
>

Whatever url "paramifiers" are supported,
the full documentation of which appears missing.
This should be (y)our primary concern for now.
 

> *My question is *what can be done to control this - and/or other 
> "aspects" such as accessing field values, set parameters and even create 
> tiddlers... *via the URL*? 
>

It would require another paramifier to specify a template / dynamic tiddler 
that:

   1. either already exists
   - I guess that's not what you want, because you seem to want full 
      control outside of what is already present
   2. is encoded in the url hash
      - unpacked by tiddlywiki
      - rendered using an appropriate component that knows how to handle it
   
In the above example, I might want to present the result in a single 
> tiddler and with the plugin title followed by its description.
>

So, you'd need to pass your desired template uri-encoded to TiddlyWiki and 
it would have to know what to do with all that, e.g. use some (temporary) 
tiddler *$:/core/ui/Startup* to render this dynamic template.

Is it possible to combine a regular TW permalink with a command like that, 
> straight in the browser url?


It all depends what you eventually what to achieve. 

Is it possible to "pull out" field values in the TW and present them in an 
> temporarily created tiddler at the appearing site? And other types of 
> queries?


With the above mentioned "dynamic template" thingy, possibly.

Is it possilbe to overwrite data as it is being displayed? 

For instance, can I set my own style for background color for when I load 
> at tiddlywiki.com?


It would require another type of paramifier, e.g. "dynamic actions". There 
you would specify, url-encoded(!), the actions to be performed on startup, 
leveraging whatever actions the core / that wiki supports.

All this sounds reaaaally man-hour-intensive in terms of development.
So, the question would be: What's are the benefits of all this?

Best wishes,

Tobias.

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