A Vim plugin or script can define new key maps to let the user invoke the commands and functions provided by the plugin. A Vim plugin can also invoke key maps defined by other Vim plugins. A plugin can choose to map any available key. But to avoid surprising (annoying) the user, it is better not to use the keys that already have pre-defined functionality in Vim. In a Vim plugin, the ":normal" command is used to execute normal mode commands. For example, the "gqip" normal mode command is used to format a paragraph. To invoke this command from a Vim plugin, the following line can be used: