My MacBook Pro has suddenly - and mysteriously - lost the ability to generate a WiFi network for my WiFi-only tablet. The thing just doesn't appear in the tablet's list of available networks.
Rummaging through the utilities on the MacBook I came across where I thought it should be, but short-term memory probs mean I can't name the location.
And I can't find it again. 
Can anyone run me through the steps to re-create it?
