There are two ways to access lab machines remotely: either use X2Go on
your computer (recommended) or use scp/ssh to copy files and run
commands remotely

If you want to use scp/ssh you can work on assignments from home if
you have a command terminal in which you can submit

     ssh [YOUR-CCID]@ug01.cs.ualberta.ca

to connect to ug01 (a lab computer). You can also use ug02..ug34 if
ug01 is too busy. [replace [YOUR-ACCOUNT] by your ugrad account id]

To transfer files from your home computer to a lab computer use

     scp local-file [YOUR-CCID]@@ug01.cs.ualberta.ca:

On Windows, you can use ssh clients like Putty to connect to a lab
machine or transfer files

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In the command terminal you can use editors like emacs, nano, or vim
to edit your files. You can also connect multiple times to use one
terminal for editing and the others for compiling or testing.

All this is good, but using X2Go is a bit better ...