IP tracing from a Yahoo chat room is highly unlikely without hacking into Yahoo, as their servers remove such information when relaying messages. While an IP address can provide a general location, it typically cannot pinpoint an exact address, especially if the user does not engage in email or messenger services. Anonymizers can be used to send emails without revealing the sender's information. In larger cities, IP addresses may route to the nearest major city, with DSL providing more localized data. Direct connections during chats, such as through file transfers, may allow users to see each other's IP addresses using commands like "netstat -a." Overall, concerns about IP tracing in public chat rooms are often exaggerated.