Hank, to be honest, I have no clue....if you're cheating in a virtual game w/ no real money at stake...well, that speaks more about them than anything else.
I'm not aware of any way to cheat with this since it's straight automated, but who knows. I'm not accusing anyone of cheating, either.
MarketWatch sucks, there's gotta be better alternatives, but instead of waiting for DonnyWalkerBlack or whoever to actually launch a game, I just did it myself. I doubt I'll be the one to run something like this again, I have no time...would like to find a game w/ options, though.