GGoogle chat vs Skype

[Roger]

> How are Skype users addressed? I suppose I am OK if I know their
> telephone number.
Skype, for me on Unbuntu and Fedora took about a few seconds to install.
Read the skype instructions for how to use.
To use, you need the skype addresses of the people you wish to contact, 
from memory there are lists of skype users that you can choose from.
If yo want to telephone people using skype that's another matter.
Roger