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How do ball machines throw balls?

All quality tennis ball machines presently available on the market use wheels to throw the ball. Normally there are two wheels that turn in opposite direction (thus the label "counter rotating wheels") and have a small space between them. The ball rolls down a chute and is squeezed by the counter rotating wheels which then eject it. The situation is not all that different from gravel being thrown from under a spinning tire, though in the case of the tire only one wheel is responsible for the "throwing".

What is the difference between two-point and six point mounting?

Proper and safe stringing requires that the racquet frame be mounted securely and that it not slide while sections of strings are tensioned. It is not uncommon for the pull of the string as it is being tensioned to cause visible distortion in the racquet head.  Avoiding frame damage is therefore imperative.  Some stringing machines hold the frame at the tip and at the throat (picture on the left).  This is known as a two-point mounting system.  Other machines hold the frame at several locations and are known as multi-point (usually six-point) mounting sysems. Not all six-point mounting systems work the same way. Some system place supports inside the head at the tip and throat and four side supports on the outside (picture in the middle).  Some mounting systems provide six support points on the inside of the head and are known as "inside six-point systems" (see picture on the right).

What are the main attributes that distinguish different kinds of strings?

The material used in a string (for example "nylon" in the case of synthetic gut), the construction of the string (a solid core surrounded by a single wrap of thinner filaments in the case of synthetic gut), and the gauge, or thickness, of the string define the essential characteristics of a string.