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The installer probably mounts the NTFS partition that is marked bootable and uses heuristics to determine the version of Windows is installed.

Another way, perhaps in other circumstances, could be to use named pipes. For instance:
$ mkfifo cmd1 cmd2
$ exec 2>/dev/null; echo -e "this\nthat" >cmd1 & echo -e "first\nsecond" >cmd2 & paste...

awk '/^processor/ { processor = $0 }
/^model name/ { print processor, $0 }
' /proc/cpuinfo

I'll leave the removal of "model name :" to you.