Horizontal Sliders are transaction window systems ideal for convenience stores, fast food outlets, government offices, and other high profile/high traffic facilities. The horizontal slider system, as its name suggests, slides open and closed from side-to-side, while its counterpart, the vertical slider, lifts upward to open. This system is made up of two pieces of overlapping bulletproof glass, where one slides behind the other to provide uninterrupted interaction with customers. When closed, employees can maintain communication with customers through one of several talk-thru options as well as a package passer or currency tray. Because the horizontal slider must fit within the available counter space, the window opening is limited by the width of the counter. This system can be locked into place should there be a threat to security. By pushing the slider tightly closed, a plunger pin will activate locking into the bullet-resistant frame so it cannot be opened.