4. The apparatus of claim 3 , wherein one or more of the descriptors comprises a second parameter identifying a section of the program instructions that the interpreter executes during the duration of the lighting described by the descriptor.
4. The apparatus of claim 3 , wherein one or more of the descriptors comprises a second parameter identifying a section of the program instructions that the interpreter executes during the duration of the lighting described by the descriptor. 5. The apparatus of claim 4 , wherein the first parameter is a repeat count indicating a number of frames of lighting described by the descriptor, the second parameter identifies a subroutine in the program instructions, and the interpreter operates to execute the subroutine once for each of the frames described by the descriptor.