Gyration GyroRemote and Mobile RF Keyboard - Manual (Page 16)

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simultaneously with any of the devices on the other channel. Two
devices that share a channel may not be used simultaneously.
When installing the devices try to determine which devices will be
used simultaneously and set them on opposite channels.
The following example describes a single-receiver system with two remotes
and a keyboard that requires one remote to be used by a presenter for
cursor control while another presenter inputs data on the keyboard. Remote
#1 is set to channel 3 and the keyboard and remote #2 are set to channel 5.
With this configuration, remote #1 and the keyboard can be used
simultaneously, but remote #2 and the keyboard cannot.