One of the game elements of Telehack is the quest command. This gives you an output similar to this:
Hack your way to the host: TECHSUP The host contains this file: QX93879.SYS Read this file and it will give you further instructions.
The goal of the quest is to read the contents of the .sys file on the remote system, and follow the instructions contained within. When you accomplish the quest, you will be given a badge (if it is your first quest), and you can feel good about yourself if it is a later quest.
But the quest is not so easy. Part of the challenge of Telehack is to figure out how to get past the various obstacles that stand in your way. You can find hints in telehack.txt, in help, and in sysmon.txt.