Sharing a SyntaxLanguage?

It's really easy... in the Documentation look at this topic:
Language Definition Guide -> Loading and Saving

There are static methods on the SyntaxLanguage class that let you load a language independent of an editor. Once you have that, just set it to the SyntaxEditor.Language property of every SyntaxEditor that should use it.

In the new 2.5 version we're working on right now, we're allowing Documents to be separated out from the user interface and even loaded and parsed independently of a SyntaxEditor. In that version the Language property is being moved to the Document class. This will be a really handy feature because then you can load a file into a Document, parse it with a SyntaxLanguage, and iterate through its tokens without even needing to load any SyntaxEditor control!