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
Show Recent Items in Snow Leopard
The Recent Items submenu in the Apple menu is handy, but what if you want to work with a file in there in the Finder, rather than open it? Just press Command when that menu is showing, and all the Applications and Documents change to "Show ... in Finder." This feature is new as of Mac OS X 10.6.3 Snow Leopard.
OS X Yosemite’s Handoff Will Require Bluetooth 4.0