As data from a Microsoft Access database can be cached in RAM, processing speed may substantially improve when there is only a single user or if the data is not changing. In the past, the effect of packet latency on the record-locking system caused Access databases to run slowly on a virtual private network (VPN) or a wide area network (WAN) against a Jet database. broadband connections have mitigated this issue. Performance can also be enhanced if a continuous connection is maintained to the back-end database throughout the session rather than opening and closing it for each table access. If Access database performance over VPN or WAN suffers, then a client using Remote Desktop Protocol (such as Microsoft Terminal Services) can provide an effective solution. Access databases linked to SQL Server or to Access Data Projects work well over VPNs and WANs.