begin [ANSI|Unicode] > use(%gnGroup%)
The begin statement tells Keyman which group should be processed first when it receives a keystroke. You can specify either ANSI or Unicode starting groups in a single begin statement. If both are omitted, the ANSI option is assumed.
You can include two begin statements in a single keyboard file. In this case, one must be Unicode and the other ANSI. Keyman will determine which group to use on the basis of the active application.
begin > use(main) begin Unicode > use(main)
This line originated in SIL-CC, and a simplified version was used in Keyman for consistency. The ANSI/Unicode distinction was introduced in Keyman 5.