delphi - How to return an embedded window to windows as parent -

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I'm using ShellExecute to launch Adobe Reader. After that I will get the window with WinApi.Windows.SetParent Redirecting to a panel. Now when I close my app, Adobe Reader is still active in memory and I must finish the process in Task Manager before opening a new session.

My questions are: How do I get Adobe Reader in my app? How do I talk to it? (Stop sending messages and minimizing it) and how do I return them to the windows as parents?

Edit Delphi XE5:

This is the code that I use to set up new parents: 

  ShellExecute (handle, zero, picarah ('c: \ tool \ temp.pdf'), zero, zero, SW_SOWNOWNMAL); Sleep (500); WHandle: = FindWindow (zero, 'Temp.pdf - Adobe Reader'); WinApi.Windows.SetParent (wHandle, Panel1.Handle);    
 
 
 Here are my answers to my questions:  
     
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     I have been saved in the WH and Wear because this is a global variable, so I can get it anywhere in my code. Like my form's on-close event   
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     To 'talk' to the ebob reader, I have to use the Sand Message method and pass the required parameters. I can use wHandle to point to Adobe Reader. The creator of Adobe Reader is not really a problem.   
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     When I want to root Adobe Reader as Windows, then I just change SetParent's NewParent parameter from Panel 1. 0 from handles    
     I got the reply from my question and got the reply. They all told me in the right direction.

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