Print Router

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To submit a document for printing, the application communicates with the client side of the spooler (Winspool.drv). Winspool.drv makes an RPC connection to the server side of the spooler (Spoolsv.exe), which makes a direct API call to the print router (Spoolss.dll), which is also on the server side of the spooler. The print router passes the print job to the local print provider.