Ctrl-H is an option to display the API documentation for the current word.
But this does not work for any other methods or classes that can be defined or included in your project. For those I wrote the TextMate Bundle command (you can easily assign it Ctrl +] , for example) who are looking for a class or method definition under the carriage and display it in a tooltip, along with the file name and the line in which it was found.
Check this out: Add a shortcut to TextMate to search for a class or method definition in the tooltip
I hope you find this useful;)
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