1. A method of configuring a material handling system comprising: providing a computer having a visual display; inputting information into said computer to cause said computer to visually display at least one path for a material handling unit and at least one symbol representing at least one action location at a position specified by a user; inputting further information into said computer that at least partially specifies what action will take place when the material handling unit arrives at the at least one action location; creating with said computer a computer file containing a location of said path, a location of said at least one action location, and the information that at least partially specifies what action will take place when the material handling unit arrives at the at least one action location; and transferring the computer file to a unit controller adapted to read said file and utilize the file to control the movement of the unit along said path and to control the action undertaken when the unit reaches the action location.