Handoff will be one of the coolest features of OS X Yosemite and iOS 8, letting you seamlessly transition between workflows on the two platforms, but unfortunately for owners of older Macs, it will require Bluetooth 4.0, which excludes Macs built before 2011, and even many built later. Peter Cohen of iMore explains how to check which version of Bluetooth your Mac has. If your Mac isn’t compatible with Handoff, a USB dongle that provides Bluetooth 4.0 may enable Handoff by Yosemite’s release. follow link
Move Multiple Windows Simultaneously in Spaces
Command-drag a window in Spaces to move all windows associated with the dragged window's application to a new space. Control-drag will do the same thing, and will also preserve the same screen position in the space in which you drop the windows.
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OS X Yosemite’s Handoff Will Require Bluetooth 4.0