Page
A page is an area on the computer display screen that is mapped to a LED display for showing visible media sources (such as videos, pictures and text) on the LED display.
Global page
Global page is a special common page that it always stays on the front of all other common pages. In the case that common pages of different window layout are needed while a window at a fix position is also required (such like that for clock, weather info or scrolling text), putting the fix position window in a global page is the best way for the window layout design. But if only one common page is needed, a global page may not be necessary as the fix position window can be set directly to the position required.