Message Queue Reference (Windows Embedded CE 6.0)
1/6/2010
This language reference section contains descriptions of message queue programming elements.
Remarks
Message Queuing uses memory-mapped files to hold queued messages. There is no upper limit; the queue is of infinite size (constrained by system memory). The files are each a fixed size of 4 MB, which is also the size limit of a Message Queuing message. The driver (Mqac.sys) maps the files to kernel memory address space when Message Queuing runtime sends or receives a message.