Textures and Apple Events
Textures has a suite of Apple Events that allow other applications to benefit from TeX's fine output capabilities.
Starting with Textures 2.1, the suite includes the ability for external editors to access the Synchronicity, Flash Mode and Follow Focus features. Plug-ins have been developed for Alpha and BBEdit.
If you are a programmer and interested in developing your own the software interface, the details of the specific events is in a document downloadable in DVI or PDF format.