One of the first rules of shooting video and still is that you don't shoot into the sun or windows. Always try to put it at your back and into your subject. However sometimes (or most of the time) we cannot control the situations we are put into as news gatherers.  Even for those of you not even remotely concerned with photography but just want to have better pictures at family events on your pocket sized point and shoot camera, don't shoot into a window, you need a flash and a pretty good one to pull it off, so just save yourself the trouble and shoot them somewhere else.  

Now generally, when in this situation we would shut the blinds in the window and go on about our business with our normal three or even two light set up.  If the window has no blinds though you have two options, one, make the window work for you or two, make the window work for you.  You would either want to turn your subject into the window, which can be done fairly easily in a boardroom situation or if you have a light powerful enough, use the window as we do in this video as your back or hair light and use your second light (this situation is a quick setup for a rushed situation which happens a lot in this business, you have 5min tops to get this interview set up) as background light.  So it essentially is a two light with scenario one, where the window is your key light, light one is your hair light and light two is your background light OR scenario two, where your key light has a dichroic filter/blue gel, the window acts as your hair light and your second actual light is your 3rd and/or background light.

You could even do this without a blue gel/dichroic on your key light, just make sure your key light is powerful enough, and white balance for it, you window/hair light will become a little blue, that's OK for a hair light and your background light will be the same as your key light.  As long as the face is the right color the rest is secondary and less important.

Also important, what you want to do and I did an OK job but not great job of, is you want to set your iris for the window exposure and then bring in the lights on your subjects face to match.  So point your camera at the window, bring your iris down to where you can see whats happening out side as it would look normally, then bring your camera back to your subject and bring the light or lights as close as you need to your subject.  Yes, this can be difficult with the smaller lights and you'll probably need two and your subject will get a little warm...literally.  If you cannot put enough light on your subject to match the window, its not the end of the world, just get them close and as you'll see in this video, its not perfect but you can still see fairly well what is going on in the parking lot and its not blown out and harsh on the eyes.

Hope this helps a little and if you want to see anything else or have any requests for lighting/photo situations you've come across and were curious about leave a comment and I'll do my best to answer them well.