HOW-TO-USE.md

Please ensure, that:

1. you do not have any open handles (DB connections, Files, ...) when:
2. executing the create method
3. you are not using objects in the child process, that are going to close shared resources (f.e. in the __destruct method)
4. your child processes create their own handles (DB connections, Files, ...)
5. you use the semaphore or other locking mechanisms, when accessing shared ressources

In case you need handles (f.e. DB connections), open them in the children in the onProcessCreate method and close them in the onProcessDestroy method