Filemaker and Filemaker Advanced will open and share a database with 9 usess that have Filemker.
Filemaker 7 through 11 are one file format, Filemaker 12 is a separate and new file format.
FileMaker Go12 is free for the iPhone, iPod Touch, and iPad and can run a FMP 12 database or access a hosted FMP 12 database.
FMP and FMPA will share with Instant Web Publishing with 5 concurrent users through broswers.
There is FileMaker Server and Filemaker Server Advanced - allows more users.
There is Custome Web Publishing that is complicated and allows very many users through web browsers.
Filemaker Advanced can make tuntimes of the database that are single user, no networking, and the Mac version has to be created on a Mac, the Win version on a Windows machine.