For the print client role, the print spooler service can usepolling to collect changes that are related to printers or to print jobs on the server,or the print spooler service can call the Print System Remote Protocolnotification callback functions that are exposed in that protocol's RPCendpoint. Firewall settings or Windows Group Policy settings canprevent the client from receiving printing notifications. The Windows behavioris to use polling in such scenarios. Additionally, the print spooler serviceexposes local interfaces that are used by client applications to print, obtain print queue status,administer print queues, or perform other print-specific actions.