bool _visible; Indicates if the border surrounding the entity is to be drawn or not. <br />
CFrame* _frame; holds the container (another CFrame) which has opened this one (owner or container of the current CFrame). '''_frame''' will be NULL if this CFrame does not have a container, in which case, it will be full screen and no matter what the values of row, col, width and height are, CFrame will be '''Full Screen''' (no border will be drawn)<br />
char* _covered; is a pointer to a character array that hold what was under this frame before being drawn. When the CFrame wants to
hides itself, it simple copies the content of this array back on the screen on its own coordinates.
===Methods and Constructors===