gistfile1.txt

The Host line can contain multiple strings (and wildcard matches).

With this config:

Host deeplearn-v100 ec2-XXX-XXX-XXX-XXX.us-west-2.compute.amazonaws.com
    HostName ec2-XXX-XXX-XXX-XXX.us-west-2.compute.amazonaws.com
    User ubuntu
    IdentityFile ~/.ssh/aws-key.pem
    IdentitiesOnly yes
    ForwardAgent yes
    LocalForward 9999 localhost:8888
    LocalForward 6006 localhost:6006

I can use the CLI as:
$ ssh deeplearn-v100

I can also use the CLI as with the same SSH config:
$ ssh ec2-XXX-XXX-XXX-XXX.us-west-2.compute.amazonaws.com

So I can use the shortcut for convenience, and any program that SSHs to that hostname will automatically be logged in.