Macworld has posted an article by Albert Filice explaining how to create your own Fusion Drive from a normal hard drive and an SSD. It’s not difficult if you’re comfortable working in Terminal, but be sure you have full backups before you start, because the process will erase both drives. follow link
Dragging between Spaces
Juggling various applications within multiple Spaces? If you drag an application window to the edge of your screen and pause for a moment, Mac OS X will move the window into the space that lives in that direction.
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Make Your Own Fusion Drive