How to pair more than one device with a Logitech receiver
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with A – UsedPC.com