If you look at the results from the first Tools of the trade challenge, there are many images with only one tool. I guess when I suggessted it way back when, I should have been more specific.
I would interpret tools of the trade to mean whatever you use to accomplish your job. Does not have to be a tool you hold in your hand. In this regard, a piece of software could be a tool.
These threads about the technicalities of challenges are getting annoying. All they seem to be is fodder for what's voted low and what's voted high before the challenge even starts.
