A general module is a code module not associated with a form or report. You can create a general module with the VBA menu Insert command.
The code does call txtCity_AfterUpdate from txtInfo_AfterUpdate.
'Does not work' means what - error message, wrong results, nothing happens? Since it is from your db, it really should work. I didn't modify anything else. Make sure the event properties still have the [Event Procedure] parameter.