yeah it should be able to handle it no problem,it's only a half life 1 mod
the instructions for doing the co op seem kinda like a bother....basically how Terreria multiplayer was,you have to know the host's I.P.
"You just have to make a server manually.
Make sure ports 27015 and 27020 are forwarded if you're using a router
Start a server in the main menu, not on lan, and without a password.
Go to www.whatismyip.com and copy and paste the IP to whoever wants to join.
Tell them to type in the developer console:
connect [ip address here without brackets]
And voila.
Using this method I played and finished co-op in just a few hours with a friend of mine."
http://steamcommunity.com/app/223710/discussions/0/828937420112841213/