CHAP is very similar to PAP but allows greater flexibility. Don't worry about which your program supports. Either will do. The third method of starting PPP is to go through a unix-style login process, but use your special PPP login. This is the only time that you should use anything but all lower-case for your login name.
Most idiom accounts have static IP addresses.
You will have the same IP address every time you log in. If you do not have a static IP address then you will be assigned one each time you log in. You will also be assigned a gateway address and a netmask. Usually your gateway address will be 209.157.64.97 and your netmask will be 255.255.255.255 .