Seems too simple, right? Who doesn't know how to create a new drawing in AutoCAD? You click the NEW button in the Quick Access Toolbar (QAT), or choose NEW from the Application Menu, or type in NEW at the command line....right?
Do you really know what each of those do though? The NEW button in the QAT actually executes the command named QNEW. If you choose NEW from the Application Menu or type in NEW at the command line, you are executing the NEW command. You may have other UI elements such as toolbar buttons that call one or both of these commands. What is the difference?