Re: Determining if a process is visible on the Taskbar...

Theoretically, it should just be a matter of testing all the window's WS_EX_APPWINDOW [1] extended style bit.  EnumWindows, as someone suggested is a good way to do this.  For example:

private delegate bool EnumWindowProc(IntPtr hwnd, int lParam);
[DllImport("user32.dll")]
private static extern int EnumWindows(EnumWindowProc callPtr, int lPar); 

public void TraceProcessTaskBarWindows()
{
	const int MagicNumber = 10;
	const int GWL_EXSTYLE = -20;
	const int WS_EX_APPWINDOW = 0x40000;
	EnumWindows(delegate(IntPtr hwnd, int lParam)
	            	{
						if(lParam != MagicNumber) return true;
						IntPtr exStyle = GetWindowLong(new HandleRef(this, hwnd), GWL_EXSTYLE);
						if (((int)exStyle & WS_EX_APPWINDOW) == WS_EX_APPWINDOW)
						{
							Trace.WriteLine("Found window in task bar");
						}
	            		return true;

	            	}, MagicNumber);
	return;
}

[1] http://msdn.microsoft.com/en-us/library/ms632680(VS.85).aspx

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