Thanks again on looking into this for me Pure Morning. As to the purpose of "SCcontrols," I assumed that the flag was a final reference to the window. I have interpreted the script from that which I took from the textbook "Mel Scripting for Maya Animators."
On your suggestion, I removed it from the string. Nevertheless, when I once again tried to source the script, I got another error message--something about mel line 288 : too many arguments. Expected 1, found 2. I've no idea why that would be. Any suggestions? 'seems peculiar since the script doesn't have that many lines!