run adprep /forestprep twice

I'm not sure if  w2k3 adprep /forestprep has already been run

runnig it twice, can make any damage  or just an error message ?
yechimovichAsked:
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Jay_Jay70Connect With a Mentor Commented:
nope thats fine, you cannot cause any issues
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ryangormanCommented:
The following URL provides the answer and details the reasons
http://technet2.microsoft.com/WindowsServer/en/library/cfe07b0a-20d1-4b9a-8faa-044e43cbb5921033.mspx?mfr=true

"You can run Adprep.exe multiple times, but it performs actions only once. For example, Adprep.exe does not adjust access control lists (ACLs) each time you run the command."
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