multiplexer(mux) - allows multiple people to use the same TTY
(we did this with screen and also opened up different windows)
VNC is technically multiplexer
needs to handle multiple input and output
google docs is an example of multiplexer

when using screen (ctrl+a) + ? will show shortcuts

command to show the network connections
ss -taln 

apache is the most commonly used 


common convention for gogs pages is to use git.domain.com

can have many websites hosted from one domain
can add diff websites into DNS with same domain
apache was default for port 80 on the domain for gogs