As of today here where I think it is: Login to Splunk.com Under the menu there is option for Support > Support Portal Under the menu there is Get Started > Certifications You should see the certificates here. Also, you can find them on Credly if you have connected it properly. I hope this helps!!!!
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Yes... Just have Search Heads and Deployer all on Windows.
http://docs.splunk.com/Documentation/Splunk/6.5.1/DistSearch/SHCsystemrequirements#Operating_system_requirements_for_cluster_members
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