From FCKeditor Docs

FCKeditor provides a clean and simple user interface which should be familiar to users who worked on common desktop text editors like.Microsoft Word or Open Office. It consists of four distinct elements:

• Toolbar - the area at the top of the editor, which contains many different buttons. You will use these buttons to activate the programs functions.
• Editing Area - the area below the toolbar. This is the place where you type your text in.
• Context Menu - a menu with functions which appears when you click the right button of the mouse inside the editing area.
• Dialogs - small windows that appear when some of the functions are activates, used to provide the necessary information to accomplish that function.