Syntax: SavePrefs [filename]
Abbreviation: SP
saves the current preferences to the given file.
If the optional filename argument is not specified, the file
requester is opened, and you are prompted to select a file. (You can
inhibit the file requester opening by using the NoFileReq
command; see NoFileReq.) If you escape from the file requester, you
can input the file name on the command line.