I don't think you can, contrary to the information in the Help file. But from my understanding I also don't think it makes much of a difference: OS X will try to start as many applications in parallel as possible. I assume that within a second OS X fires of the open commands for your login items which are then loaded virtually parallel. So if you have one app that takes 15 seconds to open and another that opens in one second, the latter should always be ready before the first. If you prefer a specific order I think you have to work around by writing a little shell or Applescript and then adding that script to your login items. Not pretty, I know. But it works. Björn