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An FMLI command is a command that is part of the Form and Menu Language and which forces a screen related operation to occur. FMLI commands cannot be executed in backquoted expressions; however, a backquoted expression can generate an FMLI command. Only descriptors of type command can evaluate to an FMLI command: action, done, help, oninterrupt, and rmenu. A command descriptor must evaluate to a single FMLI command. If it does not, the terminal bell will sound. The FMLI commands that take arguments are noted.