By far, malware problems are the most frequent support case out there. You hunt and remove the buggers on regular maintenance sessions. New customers would often call you, asking to fix a machine that’s strangely behaving, the screen is locking up, etc.
Remote access tools are the bread and butter of today’s support technician. For many remote access needs, traditional tools (bundled with the OS, provided by the OS vendor, etc.) are used: RDP, SSH clients/servers, Telnet, etc. Let's see how they compare with each other.