I did a little debugging from the MT4 Zorror EA script. It seems when I choose the Real option, Zorror send through a command 160 (comment) then it follows with a success connected message. If I have chosen the Demo option, then no command is sent through to the MT4 script. This is all done using the same account setup and just choosing the different account type.

I am using the Zorror 1.54 and the MT4 bridge was installed using the files from ZorrorMT4.zip, which comes with the Zorror installation.