Would appreciate some information about various remote window members

1)

Code:

foreach (var foundwindow in RaptureAtkUnitManager.GetRawControls)
 {
Log("{0}",foundwindow);
 }

GetRawControls does not use caching and just retrieves the list of active windows, this should be used when operating in a thread outside the main bot thread.
Update updates the caching list and is called via the pulsator, the rebornconsole is kinda naughty and just pulses everything via Pulsator.Pulse(PulseFlags.All); since its operating in a different thread. This is something that you should never do in an actual plugin.

All the RemoteWindow classes are implemented a bit strangely, they all inherit atkaddoncontrol which also inherits remoteobject which provides the IsVaid (which checks to make sure the objects pointer is not zero). Most of the remote window functions are declared as static to make them easier to access and are implemented along these lines

Code:

        public static bool IsOpen
        {
            get
            {
                var window = RaptureAtkUnitManager.GetWindowByName("Request");
                if (window != null)
                {
                    return true;
                }
                return false;
            }
        }

You can assume if window isopen is true then it is also valid but not the other way around.