What does my Visual Studio 2010 toolbar button do?

I've added some custom toolbar buttons to Visual Studio that call macros-开发者_开发知识库-some I've written, and some that are Microsoft's.

Some of the buttons have been there a while, and I've forgotten just exactly what they do. So, for a custom button that already exists on my toolbar (that I've added in the past), how can I determine what macro (or command, or whatever) it is calling?

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You can use VSCT Power Toy to find out.