The rate at which the monitor is refreshed. A 60 Hz monitor is redrawn 60 times per second. Synonymous with refresh rate . The action of moving the electron beam from the bottom to the top of the screen. The amount of elapsed time between retraces of the screen.
All video monitors use an electron beam to sweep the phosphors at the face of the monitor.
Because the phosphors glow for only a brief period of time, the entire screen must be reswept periodically by the electron beam. The vhandle can exist longer than the object that it identifies. After a software object such as a swidget is destroyed, the vhandle for that object remains defined. A colormap implemented in hardware. Graphics requests can be performed on a window when it is not viewable, but output will not be retained unless the server is maintaining backing store.