A host or server in Telehack is an independent node on the network. Most hosts are connected to other hosts, presumably via the early internet. However, there are groups of hosts connected only to each other and not to the rest of the network. Likewise, many BBSs are disconnected from the rest of the network, and can only be accessed by dialup.
For the most part, when this Wiki refers to a host or server, we're not talking about a BBS.
Hosts are run on many different OSs, including:
Commands useful when approaching hosts are: