(...)
vec_set(screen_color,vector(222,1,1)); // blue
//Declare a DWORD COLOR REFERENCE, using the RGB macro.
COLORREF rkey=RGB(1,1,222);
reset(camera,SHOW);
//GET THE CURRENT HWND WINDOW STYLE... AND CHANGE IT TO LAYERED EFFECTS
SetWindowLong(hWnd,GWL_EXSTYLE ,GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
//CHANGE THE WINDOW LAYER...
SetLayeredWindowAttributes (hWnd,RGB(1,1,222),60,LWA_COLORKEY | LWA_ALPHA ); //FLAGS KEYCOLOR + ALPHA