Sashkey
A Sashkey is a passport for your gadget, and replaces the username and password you would otherwise need to access this service.
Keep it to one Sashkey per gadget to avoid giving your gadget a split personality.
Many gadgets? Create one Sashkey per gadget to tell them apart.
Give your sashkey a name and click "create" to have the sashkey created on your device.