Hi Fess, Thank you, i'am learning every day about Lua and programming. So if i use the PMDG 737 Event ID's, the Lua code for the course selector looks like:

if (string.find(datastring, "A56")) Then
ipc.control (70008, 536870912) -- Left course Up
End

if (string.find(datastring, "A55")) Then
ipc.control (70008, 214748364 -- Left course down
End

Am I right?