... answers for these functions. 11 .5.4 More on Drawing Drawing to a window is easy for programs but involves complex processing by Symbian OS as you can see in Figure 11 .12 . Figure 11 .12 On ... Battleships. 11 .5 .1 CONE Every GUI client uses CONE, the control environment, to provide the basic framework for controls and for communication with the window server in Figure 11 .9: TEventCode ... cases, it's impractical for the application to redraw the window, for instance, if it's: an old-style program that's not structured for event handling, and so can't redraw;...