IOGear M1057 - Manual (Page 37)

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If you would like to use a USB device that is being occupied by another user you may send a courtesy
message asking the user to disconnect. You may do this by right clicking on the USB device icon that you
will like to use and selecting “Request Remote to Disconnect.” A message will then be sent to the user
requesting that they disconnect from the USB device.
NOTE: If the occupying user denies this request, then you will not be able to send any further request to
the same user for 5 minutes. This is to prevent any user from flooding the occupying user with multiple
requests within a short period of time.
Request to Disconnect in Vista