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For those of you who want multi-window working, Synergy Team has just released Synergy ROM now available for flashing on all U.S./Canadian dual-core Galaxy S3s.
Upon my testing, the Sprint and Verizon versions are flawless whereas I was having some problems with network signals and rotation (opposite).
For fixing rotation, you can simply flash a different kernel like KTweaker kernel for AT&T and T-Mobile variants (See download link below).
I think because this ROM is ported from Verizon CDMA phone, it is having a bit of trouble with network on AT&T and T-Mobile, which are GSM networks.
Neverthless, even if you don’t use this ROM as daily driver, you can try it out to see what the fuss is all about with multi-window on the Galaxy S3 and I am sure network issues will be fixed up real soon.
Download Synergy ROm for AT&T/T-Mobile/Sprint/Verizon Galaxy S3
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You will need a rooted Galaxy S3 to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF GALAXY S3! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
First time to rooting and custom ROMs? Please see our Galaxy S3 Root FAQ FIRST! Galaxy S3 ROMs
Galaxy S3 GT-i9300 ROMs
T-Mobile Galaxy S3 SGH-T999 ROMs
AT&T Galaxy S3 SGH-I747 ROMs
Sprint Galaxy S3 SPH-L710 ROMs
Note: T-Mobile Galaxy S3 ROMs are compatible with Canadian Wind, Mobilicity, and Videotron Galaxy S3s.
AT&T Galaxy S3 ROMs are compatible with Canadian Bell, Telus, and Sasktel Galaxy S3s.