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Windows API ::FindWindow function fails when called from Service application. GetLastError() also returns 0 (success?). Is this some privilege\access right problem? Do you think it’s design problem and I should use another IPC method?
leppie’s right, Windows services are usually denied in interaction with desktop. You can bypass that in XP and earlier versions but won’t be able to do in Vista and above. You’d better delegate desktop and user interactions to a GUI application. See this document for details.