It depends on what you mean but, yes if you set the configuration to be connected to the internet. Update for backtrack4 yes it would be. possible

With BT4 connected to the net last time, i made the huuge mistake of running firefox while under root and got hammered by the Broke Open trojan.
Before even getting a VM image of BT, i must ask:
While on my root account, would typing the command "adduser <username>" create a non-root account that would be safe for day-to-day internet use?
Being a Linux beginner is tough but interesting...