There are of course a number of Pointing breeds which contain that strange and fortunate DNA which causes them to freeze when bird scent is close, but in the US "Pointer" refers to many generations of breeding of the English Pointer. I have been told that the Show lines can make good family pets, but the Hunting lines seem to Live to Work, like your friends at Maggie's Farm.
Pointers are typically hunted with a bell or a beeper collar to keep track of their location. They are the classic dog for quail hunting, and are a more popular breed in the southern US than elsewhere: in the South, "dog" tends to mean Pointer, and "bird" means Bob White quail.
There are few sights as dramatic as that of a Pointer on point. Photo below is an example. This dog which hunted with some friends in Valdosta, GA in March, is pointing a covey of quail in the palmettos.
Here's an excellent review of all of the basic types of bird dogs.