What's the functionality you require? Do you want to "trigger" something in the child when the parent changes or is it just a status check? And we are of course assuming the child is started Async (parent doesn't wait for the child to complete).

Short answer for you question though, use the Reporting SmO, called "Process Instance". By passing in the Proc Inst ID, you can get the Status of that process instance.

It is just status check; the child is started Synchronously..thats why it's important to get the status.

I have built a wrapper . the wrapper only knows the parents ProcInstID  and deals only with the parent he deosnt care about anything else.

I hope you have an answer for this.

If the child is started Synchronously, there's nothing the parent can do but wait for the child to complete, so I'm not sure why the child needs to check. But the answer to your question is using the SmO I mentioned in the previous post.

Thanks DC