ScreenToClient();
ClientToScreen();
Converts the client coordinates of a given
point or rectangle on the display to screen coordinates.
void ClientToScreen( LPPOINT lpPoint ) const; void ClientToScreen( LPRECT lpRect ) const;Converts the screen coordinates of a given
point or rectangle on the display to client coordinates.
void ScreenToClient( LPPOINT lpPoint ) const; void ScreenToClient( LPRECT lpRect ) const;