--- In bb4w@..., Ian Wade G3NRW wrote:
> I'm sure this must be documented somewhere, but I haven't found
> it yet.

Find it under 'General Information... Variables... Variable types... The @cmd$ variable', or you can read it online here:

 http://www.bbcbasic.co.uk/bbcwin/manual/bbcwin2.html#cmd

"The variable @cmd$ allows an executable created with the Compile utility to access the command line with which it was executed".

Richard.