"Active (Debug)" versus "Debug" ~~ please explain these vs settings

Question

Visual Studio Debugger
Project Settings for C# Debug Configurations
http://msdn.microsoft.com/en-us/library/2kf0yb05.aspx vs2010
http://msdn.microsoft.com/en-us/library/2kf0yb05(VS.90).aspx vs2008
http://msdn.microsoft.com/en-us/library/2kf0yb05(VS.85).aspx .NET 3.0
http://msdn.microsoft.com/en-us/library/2kf0yb05(VS.80).aspx vs2005
http://msdn.microsoft.com/en-us/library/2kf0yb05(VS.71).aspx vs2003

"Sets mode for compiling the application.
Choose among
Active (Debug), <========
Debug, <========
Release,
All Configurations."

It appears that Active (Debug) and Debug are two separate choices.
However, the MSDN library fails to explain the difference between Active (Debug) and Debug.

There's no information here: "Visual Studio Debugger Project Settings for C# Debug Configurations"
http://msdn.microsoft.com/en-us/library/wx0123s5.aspx vs2010
http://msdn.microsoft.com/en-us/library/wx0123s5(VS.90).aspx vs2008
http://msdn.microsoft.com/en-us/library/wx0123s5(VS.85).aspx .NET 3.0
http://msdn.microsoft.com/en-us/library/wx0123s5(VS.80).aspx vs2005
http://msdn.microsoft.com/en-us/library/wx0123s5(VS.71).aspx vs2003

I could not find any explanation via Google either.

QUESTION:
What is the difference between Active (Debug) and Debug?

Thank you.
Regards, Gerry (Lowry)

Answer 1

The Active tab is to denote the currently active configuration. In the case of Active (Debug) it is noting the active configuration is the debug one.

You can demonstrate this by changing the current configuration to Release and then revisiting the Debug tab. It will now display Active (Release).

Answer 2

Active refers to the currently active configuration, there is a drop down list in the standard toolbar that allows you to define the current active configuration, when you change these the "Active" configuration in project properties will change.