78. The memory medium of claim 70, wherein, for each respective object in said first graphical program, said matching comprises: comparing the respective object in said first graphical program with one or more objects in said second graphical program; determining a score value for a plurality of object pairs in response to said comparing, wherein each of said plurality of object pairs comprises two object elements, said two object elements comprising said respective object in said first graphical program and an object of said one or more objects in said second graphical program, wherein said score value indicates a degree of matching between said object elements comprising said object pair.
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.