C# web debug

Question

I have a C# 2010 web application that is having problems displaying a few items from the master pages. Thus I need to be able to determine what the issue. Due to that fact, I have the following questions:

1.  F12 Developer Tools look like they can be used to analyze what a problem is. Can you tell me where I can obtain a copy of the  F12 Developer Tools? Are the part of Visual Studio.net 2010 professional edition? If so, can you tell me what part of the install I would obtain the F12 developer tool from?

2. If the  F12 Developer Tools are not part of visual studio, can you tell me where I can download the tool from?

3. Do you have directions I can follow on how to use this tool?