57. A computer-readable memory medium comprising program instructions for detecting differences between first and second graphical programs, wherein the program instructions execute on a computer including a display, wherein the program instructions are executable to implement: determining differences between said first graphical program and said second graphical program, wherein said first graphical program and said second gaphical program each comprise graphical code; and displaying an indication of said differences on the display; wherein said differences are used to evaluate at least one of the first graphical program and the second graphical program.
88. The memory medium of claim 57, wherein said differences are useable in determining errors in at least one of the first graphical program and the second graphical program.