This panel allows you to review the laser frames, and also provides additional information.
When this panel is opened, you will see the laser frame in the preview window. Also, as long as you have Show Laser Output selected, you will also see it projected on the laser projector as you move the time slider in 3ds Max, and if you press Play in 3ds Max, you will see the complete animation in the preview window and also on the laser projector.
In addition to laser preview and display, this panel also gives information about the current frame, number of points in that frame, some Z-axis information that is handy with Beam Brush, and the framenote for that frame. This panel also identifies the currently selected 3ds Max object (if any).