The program has a gaggle of methods for communication. The challenge of a compound product like this is its interface. It's basically a utility, so it should be compact and work well with the applications people use. In the case of the server, it seems you have to add any server you want to visit to your Options as your default server, the seeming equivalent of having to make a browser page your home page in order to go to it. The speed dial doesn't work intuitively.
Documentation consists only of online help, and it's only fair.
Content that exceeds the page size tends to be broken up for the aesthetic of the page, not for the unity of its purpose. But most PC users with a reasonable amount of experience can be trained to master the product in about 30 minutes. Perhaps, if you're willing to forgo video. We found the microphone intercom features were sometimes inadequate, sometimes acceptable. Timbuktu Pro Enterprise 2.0 Netopia's Timbuktu has a somewhat different pedigree than NetMeeting.