FileZilla Client Tutorial (en)

The windows are glezad at the exterior with glazing putty. From outside, use a glazing tool ( less than 5 bucks at any hardware store ) or a putty knife and remove the old putty. It will probably be very brittle and chip right out. The glass is held in place with glazier's points; very small metal points which are driven into the wood frame to hold the window. Remove the points with the point of the tool and the broken glass. Measure the wood opening, deduct 1/8 from the measurement. That is the size glass you need. Also, measure the thickness of the glass, it's probably 1/8 thick. A hardware store or glass co. can cut you a new piece of single strength glass. Buy a can of glazier's putty, a box of points and the aforementioned glazing tool. Set the glass in the opening, you can put a small dab of putty in the corners to hold it while you then set the new glazier's points. Probably 2 at the bottom and 2 at the top. Be careful not to hit or stress the glass when you press them in. Apply the glazing putty all around the exterior and tool it with the glazing tool to a slight taper. You'll be a pro by the time you're done with the first piece.