Does the SnoopStick need to remain plugged in to the computer I am monitoring?
No. You only need to plug the SnoopStick into the target machine(s) once to install the monitoring components. This generally takes less than 60 seconds. You can then remove the SnoopStick and take it with you. You can simply plug your SnoopStick into another computer any time you want to monitor the target computer(s). Nothing is ever installed on the monitoring computer because everything is self contained on the SnoopStick device.