Do I need to install SQL Server to second node in cluster prior to adding the node?

I read these instructions:

http://msdn2.microsoft.com/en-us/library/ms191545(SQL.90).aspx

But I'm not sure if I have to install SQL Server first on node 2, then add it to the cluster. Or does adding it to the cluster also install the software?

Thanks

From your question, I assume that you have an functioning single node cluster.

Add Node2 to the Windows MSCS cluster, and then install SQL Server on Node2. SQL Server will locate the cluster and ask if you are adding this Node to the SQL Server Virtual Server.