This is just an idea that works in practice but I need to know the pit falls if any.
I have made a surveying solution for fm go, The question arises of how do you stop people sending this solution to other people.
I have come up with using the ( persistent id ) function.
The idea is to send the end user a small fm go file which will e.mail the device unique id number
This unique number will be loaded into the surveying software and sent to the end user for their device.
Using basic if and else statements
if the code matches go