Currently, NetCommunity uses Direct Post/Transparent Re-Direct for it's processing method. Direct Post indicates that a form on a web site pushes information to a processor. Specifically, NetCommunity pushes the transaction information to the Blackbaud Secure Payment servers first and then to the merchant processor. 

For more information on NetCommunity and the PCI-DSS information, you can view the documentation here: NetCommunity PCI-DSS Guide