yes
The first XBOX has a (Cat) LAN Connection and a wireless addon. The first XBOX 360 has a (Cat) LAN Connection and a wireless addon. The first XBOX SLIM has a (Cat) LAN Connection and built-in wireless.
As long as you have an internet connection, you can get xbox live on a 360 or a slim.
Go to where you search for connection. The xbox live uses wi-fi for xbox live. if you do not find no connection you need these things. a modem and a router i recommend the netgear connect and play router it works perfect for my xbox slim.
no if there wire less and yes if there not wire less
yes it can but not as much as the regular xbox 360 because of the newer fan that Microsoft has included in the slim 360 so there is alot less over heating if you don't wan to get the rrod very much then you should go with the slim xbox 360.
if you don't have a wireless connection from the X-box get a connection wire and do it wired
yes it is, i use the old av cable with my slim as the cables that come with the slim have the bog standard red white and yellow components
most likely it will be low if you use wirless connection but if you are using wire then your connection is bad.
25 GB xbox 360 is a slim.
You would have to by an xbox wireless adaptor. These cost around 150 Australian
PS3 slim
Yes you can