Here's how it works: On every play in the A-11, there are two quarterbacks in the backfield at one time, both set up seven yards behind the line of scrimmage. Every man on the field wears a number that potentially makes him an eligible receiver. Potential receivers set up in "pods" at each end of the field. The line, in the base set, consists of two tight ends and a center. Once the ball is snapped, up to six players (including both quarterbacks) become eligible receivers. All of this is legal because technically, according to the rules of high-school football, the Piedmont players are lined up in what is known as a "scrimmage kick" formation (hence, the quarterbacks placed seven yards behind the line, so as to comply with the rules), and therefore, normal eligibility issues do not apply.
In this diagram, let's say (X, R, U, C, Y, E, Z) step onto the line of scrimmage. This gives you seven players on the line of scrimmage, making it a legal formation.
On every play, the possibilities are virtually limitless. Draws, wedge plays, screen passes, the run-and-shoot, the option -- all of them can be employed, depending on how the defense reacts and on how your own players execute blocks in the open field. Of course, this also means that the field is spread precariously thin, and you'd think this would allow several extremely angry linemen and linebackers to respond to such cuteness by blowing through and decapitating one or both quarterbacks. But when Piedmont implemented the A-11 last season, that didn't happen.