DIMENSION gaArrayOne(2)      && Create an array
SET TALK OFF
STORE 10 TO gaArrayOne(1)
STORE  2 TO gaArrayOne(2)
= ADDTWO(@gaArrayOne)      && Pass the array by reference to a UDF

FUNCTION ADDTWO
PARAMETER gaArrayTwo
EXTERNAL ARRAY gaArrayTwo   && Name of the array used in the UDF
CLEAR
gaArrayTwo(1) = gaArrayTwo(1) + 2
gaArrayTwo(2) = gaArrayTwo(2) + 2
? gaArrayTwo(1)
? gaArrayTwo(2)