3.3.5.2.3.2.1 Sending an Async Document Properties Request

The ASYNC_DOC_PROPS_REQ request message MUST be sent by the server in response to a request from the printing subsystem to the virtual printer driver to display its custom document properties UI. The printing subsystem provides the contents of the fMode and hServerWindow fields. The contents of the cbDevmodeIn and DevmodeIn fields, also provided by the printing subsystem, describe the DEVMODE. The OutputDevModeSize field describes the maximum data size expected, in bytes, in the Devmode field of the reply message.