HanDBase for Windows Mobile Classic/Professional (Pocket PC) 4.1
Award winning relational database, that includes: custom forms designer, multi-user syncing technology that merges two or more users records into a single database, Microsoft Access bi-directional conduit.
HanDBase Windows desktop companion program
Two-way synchronization "conduit" that merges changes made to a database, down to the record level, between your Pocket PC and desktop.
It has Multi-user sychronization technology and also
HanDBase SyncExchange for Acces