That's right. I just wrote it that wasy so it fits in one line , one size fits all... it starts recording the prompts , list all setvars and then stops the recording because just like Bigal said , if you dont , file can go Godzilla. Its only meant for temp use.
Before you begin mission impossible The Final Reckoning condersider starting clean by using (if (setq fn (findfile (getvar 'logfilename))) (vl-filename-delete fn))