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Your question is very general but the answer is likely to be yes.<br />
<br />
Messages are a general way of communicating without relying on knowing anything else about the windows involved.<br />
If you are worried about using a message that is already in use then look at RegisterWindowsMessage in help. &nbsp;This gives a unique message for an identifier, other windows will get the same ID for the same identifier.
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Your question is very general but the answer is likely to be yes.

Messages are a general way of communicating without relying on knowing anything else about the windows involved.
If you are worried about using a message that is already in use then look at RegisterWindowsMessage in help.  This gives a unique message for an identifier, other windows will get the same ID for the same identifier.

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Suppose that I have a COleControl that open a CDialog, how can I do to interact with the parent class?? Via messages??<br />
<br />
Thanks.
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Suppose that I have a COleControl that open a CDialog, how can I do to interact with the parent class?? Via messages??

Thanks.

Classes Interact

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.

System Programming

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.