Actually this syntax would be more appropriate...

Break On
if not InContainer('OU=Servers,OU=Machines,DC=TIGR,DC=ORG', 'Computer')[0]
IF NOT InContainer('OU=Domain Controllers,DC=TIGR,DC=ORG', 'Computer')[0]
shell '\\server\share\package.exe'
EndIf
endif

The above script works fine... so the questions are...
What does the [0] mean (is it something I need to worry about?
Is there an easy way to exclude particular PC Names.

I will continue to research and post if I figure it out myself.