Fill lighting for portrait using single strobe

[georgekushstanza]

I'll be shooting 4x5 400 portra and have one (1) alienbee 1600. I'll be looking to shoot indoors during the day. When I meter in most places I don't have enough light I'm only a stop or two away from what I want so I was hoping to use the strobe but not have it look overly dramatic. Ii like the way Tina Barney and bruce davidson do their work. Speaking of which how do I meter to have both the inside and outside of a window be correctly exposed? Example
I have an umbrella if that helps