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Hemlock supports keyboard macros. A user may enter a mode where the editor records his actions, and when the user exits this mode, the command Last Keyboard Macro plays back the actions. Some commands behave differently when invoked as part of the definition of a keyboard macro. For example, when used in a keyboard macro, a command that message’s useless user confirmation will slow down the repeated invocations of Last Keyboard Macro because the command will pause on each execution to make sure the user sees the message. This can be eliminated with the use of interactive. As another example, some commands conditionally signal an editor-error versus simply beeping the device depending on whether it executes on behalf of the user or a keyboard macro.
This returns t when the user invoked the command directly.