One of the coolest OEM-specific customizations found on newer Sony Xperia devices is the Small Apps feature. It allows you to run a small app atop your currently running application, making for a much more powerful multitasking interface. In fact, we’ve written about various additional Small Apps created by our community members in the past, as well as how to get the functionality back once you’ve gone to an AOSP-derived ROM.
Now, XDA Senior Member kongaz2 has figured out a way to get multiple small apps to run at the same time on the Sony Xperia T and TX, sort of similar to what we saw earlier on the Galaxy Note 3 when Senior Member soloilmeglio figured out how to get any app to work with Samsung’s Pen Window functionality.
To get started on your own Xperia T or TX, you will first need to be on a deodexed ROM. Then you simply flash the update from a custom recovery, and you’re good to go. Make sure you have a Nandroid backup handy just in case anything goes wrong, though.
Make your way over to the original thread to get started._________