PPP and ip-up

[S J]

Hi,
I have just found out that the following command

|lynx -source -auth=username:password 
'http://dynamic.zoneedit.com/auth/dynamic.html?host=www.mydomain.com'|

will automatically update my (dynamic) IP address on my DNS server 
(Zoneedit in my case) whenever it changes.
My questions are :
1)Does FC3 use PPP?
2)Do I have to configure PPP : ip-up/ip-down?
3)Where do I put the above command? Do I put it in 'ip-up.local' or 
'ip-up' or 'ppp.linkup' or 'dhcpcd-eth1.exe' ?

Thanks.