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When I open a Visual Studio command prompt (for example, opened with menu Start -> Programs -> Microsoft Visual Studio 2008 -> Visual Studio Tools -> Visual Studio 2008 Command Prompt), I get:
Setting environment for using Microsoft Visual Studio 2008 x86 tools.
C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE>
What kind of tools are available, and what are the most common uses of this command prompt?