This section lists references to essential related topics. Read these topics to ensure that you understand how the element should be used and how it should interact, or how a menu-bar item relates to the menu structure. For example, because a fundamental guideline in the menu bar topic specifies assigning a mnemonic for the standard menu-bar choices, the mnemonic topic is listed as an essential reference. You should refer to the mnemonic topic for the specific guidelines that apply.