Yes, very vague and somewhat counterintuitive. To me, NM suggests numbers and CH suggests characters. However, the example given seems to suggest that NM is a single digit and CH is two or more digits; yes|no seems a reasonable guess for SW if it means switch. blue_cowdawg definitely hit the nail on the head.

It would be nice if echoangel911 clarified what was meant.

Cheers,

JohnGG