/etc/ttys question

I was looking in /etc/ttys and see a bunch of different terminal settings. How would I log into the server via these ttys, what emulator would I need (if any) and what would I use them for?

BTW, this is FreeBSD 5.1

(example)
ttySe none network
ttySf none network
ttySg none network
ttySh none network
ttySi none network
ttySj none network
ttySk none network
ttySl none network
ttySm none network
ttySn none network
ttySo none network
ttySp none network
ttySq none network
ttySr none network
ttySs none network
ttySt none network
ttySu none

 

 

 

 

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