I mean something like other software which have design software and engine software running differently so if there any problem in design software the engine keep running until reopen the design software to resume the show.
I am asking for that so on live show I can have robust working workflow.
You can run them on the same machine, but they won't work the way you described.
Composer cannot simply "reconnect" to the already running Renderer. When you restart Composer it will forcibly restart the Renderer as well and loads the scene into it from scratch.
Also this setup has several drawbacks.
Note that the system is very stable during live production/show. It is very unlikely that it will crash. So we don't think it is necessary to implement it as you described.