The Computer ID / Target ID is based in part on the network adapter. Whichever network adapter is in use when the Computer ID / Target ID is created needs to be active when the license is used.  For example if you disable a network adapter in Control Panel or Settings, then it is unknown to the operating system and Dassault Systèmes licensing would not be able to recognise it.
The user provides the Computer ID / Target ID to their sales contact and the license is created – the license LIC/LICZ is locked to the computer that generated the Computer ID / Target ID and won’t work on another computer.
For a Network license, the license Computer ID / Target ID would be locked to the computer hosting the license server.  For a Node Lock license, the Computer ID / Target ID is generated from the computer (laptop or desktop) where Surpac or MineSched is installed.