You can get to a Notes server from a Notes client via port 22 if you use the tunnelling feature in Putty.
Useful if you are looking at an appliance type deployment for browser apps.
Note that you will need a connection document listing the ip address as localhost as you cannot type localhost directly into the server name in the File >> Open >> Lotus Notes Application window as you can ( sometimes ) with an IP address.

Image:SNTT : Accessing a Notes Server with a notes client via Port 22