Rebol Quickstart [closed] - rebol

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I've been meaning to try out rebol (or red). I think it might be the perfect fit for my next project.
I've downloaded and tested out red 0.5.4, and REBOL/View 2.7(http://www.rebol.com/download-view.html)
However, there are a couple of roadblocks for a complete beginner to rebol:
Red seems to be still in alpha so it is out of the question
There seems to be 3+(?) branches: REBOL3 - what is the difference between the different branches? I'm not sure what to start on
Most of the documentation on the internet is for rebol 2 and documentation explaining the differences between rebol 2 and 3 is.. non existent? (case in point: parse is different)
So, my question is, if I were to develop a (Windows) gui application with http access (including http authentication) where should I start?
Should I use rebol 2, rebol 3(ren c), or red?
p.s. first question ever!

Red is in alpha so you've already excluded it. Rebol 3 with view is not supported by anyone as far as I know. So this leaves you with Rebol 2. I think you can still purchase a license for the SDK. And there are many people who can answer support questions.

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I want to implement a Thunderbird-Addon and already found information on the mozilla web pages regarding Addon Development. However, some of the information is rather confusing, and thus I have some more specific questions:
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I am the developer of the WordPress plugin called WP Retina 2x. It works really well - worked a lot on it - but something bothers me.
The well-known trick to detect the Retina Displays on the server-side is to use a cookie based on the window.devicePixelRatio value. It works perfectly but I consider it to be a workaround. More annoying, you cannot know whether the display is retina or not BEFORE generating the HTML (on the first visit).
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Making with Objective-C a database in which the user could add information to it [closed]

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I'd want to create a growing database in which the user could add new info in this case different integers and I don't really know how. I've started a "Master Detail" application but when I add different elements to the table they to be mutable and different. So I want the code to do that.
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I have various documents some are large some are small, we have to draw up some form of model that would describe how a user interacts with each document when following them for a build. For example, a user might.
Follow Document 1 to Section 10 then be pointed to Document 2 to complete then return back to Section 10 in document 1 etc.
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