These include prying the doors open with a screwdriver or prybar, lifting the door or window out of its track, or breaking the glass. To secure the sliding glass door, each of these means of entry must be dealt with individually. Little can be done to prevent the intruder from breaking the glass. To prevent the door or window from being lifted out of the track, a wood or metal bar of the proper thickness can be screwed inside the upper track. This will permit the door to slide properly but will not allow the door to be lifted out of the track.
Most windows come equipped with latches.
Because many window latches do not provide ideal security, it is a good idea to supplement them. In addition to locks, there are two other inexpensive techniques for securing windows. For windows that slide sideways, use the same method as described above to secure sliding glass doors. For traditional, double-hung windows, window pinning is recommended. The bolts should fit loosely enough in their holes so that they are easy to insert and remove.