TTree->Draw problem in ROOT 6.12

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Linux - root, root.exe, rootn.exe

I am running root on Redhat Linux 9.0. I was trying out the shared memory example and root suggested using rootn. To the best of my understanding when you type root at the command line it loads root not root.exe. So my questions are: What is root.exe for in the distribution? Since I do not have a rootn executable, do I have to build one? Regards

any way use the normal root. not rootn