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Application-Defined Messages
An application can create messages to be used by its own windows or to
communicate with windows in other processes. If an application creates its own
messages, the window procedure that receives them must interpret the messages and
provide appropriate processing.
Windows reserves message-identifier values in the range 0x0000 through 0x03FF
(the value of WM_USER  1) and 0x8000 through 0xBFFF for system-defined messages. Applications cannot
use these values for private messages.
Values in the range 0x0400 (the value of WM_USER) through 0x7FFF are available
for message identifiers defined by an application for its own use. Values in
the range 0xC000 through 0xFFFF are available for message identifiers defined by
an application for use in communicating with windows in other applications.
Windows returns a message identifier in the range 0xC000 through 0xFFFF when
an application calls the RegisterWindowMessage function to register a message. The message identifier returned by this
function is guaranteed to be unique throughout the system. Use of this function
prevents conflicts that can arise if other applications use the same message
identifier for different purposes.
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All the contacts and projectsDmitry Vasiliev (just.dmitry)
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