71. The memory medium of claim 70, wherein said matching includes determining matches between one or more of said first plurality of objects of said first graphical program with one or more of said second plurality of objects of said second graphical program.
70. The memory medium of claim 57, wherein the first graphical program comprises a first plurality of objects and wherein the second graphical program comprises a second plurality of objects; wherein said determining differences includes matching said first plurality of objects of said first graphical program with said second plurality of objects of said second graphical program.