Open command is executed and a file is loaded,
look for an automatic preferences file in the `
The preferences file name is given by the extension of the file loaded,
postfixed with `
#ap'. Thus, for instance, C sources have an associated
See Automatic Preferences.
If you call this command with no arguments, it will toggle the flag. If you
specify 0 or 1, the flag will be set to false or true, respectively. A lower
p' will appear on the status bar if the flag is true.