Lan Core is a compendium of tools (software applications) used to assemble a network based on thin client technology, i.e. using thin client hardware, terminals or equivalent in the client side.
Referring to a hardware device, a thin client is basically a computer in which has been removed every component that meets any (almost one) of the following criteria: 1) the component is not strictly necessary, or 2) the functionality performed by the component can be provided by an external computer (a server or workstation).
Due to its minimum hardware requirements a thin client computer is usually small and lightweight (it can even be portable). Although can be find other kinds of computers working as thin clients, e.g. common personal computers (PC), obsolote or out-of-date computers, low-performance devices, etc.
Terminal should be understood as a synonym of thin client. This term is probably older than the term thin client, since it was used to refer to the consoles that were connected to mainframe computers in the 70s.
A workstation is a computer commonly connected to a local area network (LAN) and includes a multi-user operating system. This is basically the definition of any current personal computer (PC), and therefore a simple PC can be used as a workstation.
A workstation is usually named as server in a thin client network.