Hi Andrzej
Can you make sure that I understand what you want?
1. As I understand it, you have a program that you have made in Opus. Let's call this
Opus_program so I don't get confused.
2. You have another program which you have written yourself. Let's call this program
Your_program.
3. You want to be able to call
Opus_program from within
Your_program.
4. You don't want anyone to be able to launch
Opus_program without doing so from within
Your_program. Am I correct in my understanding?
I, and most others who might try and help you, would find it useful to know
exactly which version of Opus you are using, and perhaps some information about your hardware and OS. For example, like appears at the bottom of my post.