If you want to exclude some systems from CLIENT PUSH

If you want to exclude some servers from CLIENT PUSH
 

You can exclude the server from push installations by adding the server name to the registrykey ExcludeServers under HKEY_LOCAL_MACHINE/Software/Microsoft/SMS/Components/SMS_DISCOVERY_DATA_MANAGER on you site server. You find more information about this here:

http://technet.microsoft.com/en-us/library/bb693996.aspx