If you're really firm about retaining the abbreviation, I'd say:

Net Muggle Sourcery

The idea being that Wizards have woven spells for use by Net Muggles, who cannot cast spells of their own.

I came up with the double entendre 'Sourcery' (a misspelling of 'sorcery', as well as 'a source of source (code)', as a bakery is a source of baked goods). davorg himself suggested 'Muggle', which should be familiar to anyone who's read the Harry Potter books, the slang usage of which is described here. I provided 'Net', and there it was.