Though you could just use early start-up to select the boot device 
Yeah that's what I normally do. My tower is setup like this:
1. turn it on, reboot it, it loads up AOS3.9 ( always kludgey )
2. But there is AOS4 on a latter boot partition. ( must go into E.S. to get this to boot up..)
I am going to switch them around, AOS4 1st and then use a script to choose which OS I want to proceed to...
Which will all probably end in tears. :lol:
