Why does Adobe Reader 10.0 opens one more instance of it as a child process ?

Hi,
I downloaded Adobe Reader 10.0 and observed that it spawns one more instance (same name as parent) which opens a file instead of parent. This seems to be a significant change since last version where there was only one instance.
Can anyone tell me why is the use of opening one more instance and delegating a task of opening a file to it ? Is there any security reason behind it ? Is there any settings by which I can disable this behaviour ?
-Ajay

For future reference -
http://forums.adobe.com/community/adobe_reader_forums

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