#include AHK-CLEO-API.ahk
global cleo := new CLEO()

cleo := new CLEO()
cleo.RegisterOpcode(0x1234, "Opcode_1234")
Opcode_1234()
{
    MsgBox, Opcode_1234 was called.
}

{$CLEO .cs}
{$OPCODE 1234=0,AHK}
1234: AHK