To create a complex filter, a developer usually uses command "FILTERGROUP" to place different filters for the same field. In the first Microsoft Dynamics NAV Windows-based versions, developers were able to use filtergroups starting from 0 to 255. Some of them were reserved and used within the application like filtergroup 2 used by properties SubFormView, DataItemTableView or when you use command SETTABLEVIEW. There was also a reserved filtergroup 1, which was supposed to be a "Global filter" as it was in the DOS version.
Beginning with version Microsoft Dynamics NAV 5.0 SP1 build 28913, Microsoft introduced filtergroup 1 functionality.