Application invisibility

Hi! How to make main 32-bit application Window [for example: ;-) Handle: 000F024A, Class: Afx:400000:8:10011:0:ba4029d, Caption: IcqSnif] initially invisible?

How do you create this window ? If you create it with CreateWindow() do not use the WS_VISIBLE flag.
If you are trying to hide the window of another application use ShowWindow:

BOOL ShowWindow(
HWND hWnd, // handle to window
int nCmdShow // show state
);

This is already compiled program. I have no source code. In other words - how to find Main aplication window structure in executable (except step-by-step debugging)?

Use FindWindow:

HWND FindWindow(
    LPCTSTR lpClassName,
    LPCTSTR lpWindowName
);

Or FindWindowEx:

HWND FindWindowEx(
    HWND hwndParent,
    HWND hwndChildAfter,
    LPCTSTR lpszClass,
    LPCTSTR lpszWindow
);

Or even EnumWindows:

BOOL EnumWindows(
    WNDENUMPROC lpEnumFunc,
    LPARAM lParam
);

Regards

Make a little proggie using function EnumWindows:

BOOL EnumWindows(
WNDENUMPROC lpEnumFunc, // pointer to callback function
LPARAM lParam // application-defined value
);

This enumerates all windows on the screen, and your callback gets handle to each, so you can find and do anything you need