The Workstation part has to be installed on the local computer. It allows redirecting local USB devices to your remote session over Microsoft RDP, Teradici PCoIP or Citrix ICA protocols.
The Server part has to be installed on the remote computer you will be connecting to.
When you login to your remote session, all USB devices on your local computer will be available for connection to the remote server.
Simply click on the USB for Remote Desktop icon in the tray menu in your remote session and select the device from the list.