COMMON

command

Declare variables as shared between chained programs. MMBasic variables are already global, so COMMON is accepted as a QuickBasic compatibility form: it ensures each listed name exists.

COMMON [SHARED] var[, var…]

SHARED - accepted and ignored; all MMBasic variables are global

Example:

COMMON SCORE, LIVES
SCORE = 10
PRINT SCORE

Source: docs/help/common.txt inmmcore. On the computer, typeHELP COMMON.