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If your window is only cracked, you can use a small knife to score a small arc just beyond the end of the crack. This will keep the crack from expanding.   If the crack is only a small hole, as from a BB gun or tiny rock, you might be able to patch it. Simply apply clear fingernail polish or shellac to the area and allow to dry. For best results, apply several coats. Don't put off replacing or repairing a broken window. A broken window isn't just dangerous because of the glass, but also lets in bugs, rain, cold weather, and water. If the glass is broken, but still intact enough to keep out the elements, you may be able to patch it until you can replace it. Possible options for patching the window include:  Using super glue to patch a long crack in the glass. Start by cleaning the window with acetone, then apply super glue to cover the crack. Allow the glue to dry, and then apply another layer. Repeat this process until the crack is covered with 2-3 layers of dried glue. Masking tape makes a good patch for broken glass. Clean your window well with acetone so that the tape will adhere to the glass, then tear off a section of tape the length of the crack. Repeat this process on the other side of the window. Staple a piece of wood or a piece of thick plastic against the broken window. Double thickness trash bags can also be used to cover the broken pane. As with broken glass inside, you'll need to make sure no children or pets can accidentally come into contact with any shards of glass that may have fallen into the yard, inside the house, or anywhere in the environment. Make sure you're wearing heavy shoes (not sandals or flip-flops) and safety gloves.  You can pick up broken glass with newspaper, as above. Wrap it in the newspaper and place directly into a double-bagged leaf or heavy-duty trash bag. Remember that glass may have fallen into furniture, shrubbery, or elsewhere. You may be able to extract the broken glass from the window by lifting out each broken piece from the putty that holds it in place.  If your window is largely intact, you might have to chisel the putty from the window's edge to remove the glass. Make sure you're protecting your hands and arms from the broken glass. You can use a wood chisel, a putty knife, or even an ordinary table knife. The old putty will break into smaller pieces as you remove it. Try to get every bit of putty from the window frame, as this will help when you replace the broken glass.  Be careful not to try to remove the putty too quickly, or you might split the window frame on the window. Remove the small metal triangles driven into the frame beneath the putty. These are glazier's points, and hold the glass in place. If you come across any putty that's difficult to remove, applying heat might help soften it. You'll have to have a replacement glass that's exactly the same size as your broken glass, slightly smaller than the wooden frame. Hold the glass in place with one hand while you insert glazier's points into the frame to secure the glass in place.  Glazier points should be placed about every 4 inches around the periphery of the replacement glass. You can press glazier's tips into the wood with your thumb. You'll need to knead the putty until it's soft, then roll it into a pencil-length cylinders. Press the rolls of putty around the window frame to seal in the replaced glass.  When the new window is in place, smooth the putty with your putty knife. Scrape off any excess putty on the window pane.

Summary:
Consider if you need to replace your window. Patch the window. Secure the area. Remove the pane from the window. Remove the putty from the window frame. Replace the window glass. Apply putty around the edges of the pane.