A frame window uses a set of standard constants to identify the frame controls and the client window. The frame-control identifiers all begin with the prefix FID_ and can be used in functions such as WinWindowFromID to uniquely identify a given control or the client window. The frame controls also use these identifiers in notification messages sent to the frame window. The following table describes the frame-control identifiers:
┌───────────────┬─────────────────────────────────────────────┐ │Identifier │Description │ ├───────────────┼─────────────────────────────────────────────┤ │FID_CLIENT │Identifies a client window. │ ├───────────────┼─────────────────────────────────────────────┤ │FID_HORZSCROLL │Identifies a horizontal scroll bar. │ ├───────────────┼─────────────────────────────────────────────┤ │FID_MENU │Identifies a menu. │ ├───────────────┼─────────────────────────────────────────────┤ │FID_MINMAX │Identifies the minimize and maximize ( │ │ │window-sizing) buttons. │ ├───────────────┼─────────────────────────────────────────────┤ │FID_SYSMENU │Identifies a system menu. │ ├───────────────┼─────────────────────────────────────────────┤ │FID_TITLEBAR │Identifies a title bar. │ ├───────────────┼─────────────────────────────────────────────┤ │FID_VERTSCROLL │Identifies a vertical scroll bar. │ └───────────────┴─────────────────────────────────────────────┘