For those who want to play Garry's Mod,
the network ID is: GMOD6C2014
and the pass is: 123

as for TF2, this does not require hamachi.

For unturned, the network ID is: UNTURNED6C2014
and the pass is 123.

Look up a tutorial on how to use hamachi if you are unsure of how to join a netowrk.