Actually it's not designed to lock the windows, but simply to draw them together to prevent drafts.

Herb had the living room of his shack shut off, with an old gunny sack stuck under the door to prevent drafts.

While you work, close all doors and windows in the room to prevent drafts.

This prevents cold drafts from penetrating the cavity and allows the air trapped inside to function as insulation.

When the fireplace is not in use, the closed doors prevent drafts.

"We're installing a new ventilating system with negative pressure" to prevent drafts into the apartment.

Instead cover their surfaces with weatherstripping to prevent drafts and to help keep loose sashes from rattling.

Revolving doors are energy efficient as they prevent drafts, thus preventing increases in the heating or cooling required for the building.

The purpose of caulking is to seal gaps between nonmoving building materials like siding, both to prevent drafts and keep out moisture.

Some form of internal flashing or caulking must be placed over the joints to prevent drafts.