|I think the && translates as "and if successful". So that whole line translates as:|
start MediaMonkey.exe and wait for it to terminate. If that is successful, start EventGhost.
I'm not sure that the && will work in conjunction with /wait though. You might put them on separate lines like this:
cd "c:\program files (x86)"
start /wait MediaMonkey\Mediamonkey.exe
start EventGhost\EventGhost.exe -e
If that doesn't work, I can help you come up with an IF statement that will check for MediaMonkey termination prior to starting EventGhost.