Data related to internet usage, such as passwords, usernames, bookmarks, and browsing history, is typically stored locally on individual computers. When a different computer connects to the same internet connection, it does not have access to the previous user's data, provided the two computers are not directly networked or sharing information. However, exceptions exist, such as NAT, server-side caching, and potential ISP throttling, which may affect performance but not data visibility. If two computers are connected through a router, they share an IP address but do not inherently share browsing history or personal data unless specific sharing settings are enabled. Concerns about privacy arise if someone accesses the router's logs or if shared online accounts retain usage records, such as Google services. Overall, while casual users typically experience a distinct internet session, certain technical factors could lead to shared visibility of activity under specific conditions.