SwitchClient is a free application, it can be installed on multiple computers and requires no activation. However, switch server counts the number of Client connections and accepts or refuses them.
PowerSwitch comes with 5 licenses, which means that 5 SwitchClients can connect simultaneously to it. The FullSwitch accepts only 1 SwitchClient connection.
Follow the same procedure which is used in licensing a new FullSwitch or PowerSwitch and enter a new activation key in FullSwitch or PowerSwitch to increase the number of licenses (i.e. simultaneous connections).