Scooter is composed of several parts. Mostly, it is an API for XML manipulation designed for the Ruby programming language. A library implementing this API is well underway.
Furthermore, there is a specified API for interacting with a web browser (bookmarks and such). That is unlikely to be implemented in the near future due to technical limitations.
Additionally, there is an effort to use the Scooter API to develop applications with GUI toolkits such as gtk, wxruby, and fxruby. Work on this has been slow.
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