>> http://msdn2.microsoft.com/en-us/library/bb762159(VS.85).aspx
>
> Thanks.
>
> Hmm... looks pretty complicated. And presumably I'm going to need the 
> header files and stuff - not to mention a C compiler. Gee, it could take 
> me quite a while to figure this stuff out... :-S

I'm sure you can use some other language that allows access to DLLs?

Here is the extract from shellapi.h that should give you the layout of the 
data structures in memory and the constants (it includes two different 
versions for unicode and non-unicode):

////
//// Tray notification definitions
////

typedef struct _NOTIFYICONDATAA {
        DWORD cbSize;
        HWND hWnd;
        UINT uID;
        UINT uFlags;
        UINT uCallbackMessage;
        HICON hIcon;
        CHAR   szTip[64];
} NOTIFYICONDATAA, *PNOTIFYICONDATAA;
typedef struct _NOTIFYICONDATAW {
        DWORD cbSize;
        HWND hWnd;
        UINT uID;
        UINT uFlags;
        UINT uCallbackMessage;
        HICON hIcon;
        WCHAR  szTip[64];
} NOTIFYICONDATAW, *PNOTIFYICONDATAW;
#ifdef UNICODE
typedef NOTIFYICONDATAW NOTIFYICONDATA;
typedef PNOTIFYICONDATAW PNOTIFYICONDATA;
#else
typedef NOTIFYICONDATAA NOTIFYICONDATA;
typedef PNOTIFYICONDATAA PNOTIFYICONDATA;
#endif // UNICODE


#define NIM_ADD         0x00000000
#define NIM_MODIFY      0x00000001
#define NIM_DELETE      0x00000002

#define NIF_MESSAGE     0x00000001
#define NIF_ICON        0x00000002
#define NIF_TIP         0x00000004

WINSHELLAPI BOOL WINAPI Shell_NotifyIconA(DWORD dwMessage, PNOTIFYICONDATAA 
lpData);
WINSHELLAPI BOOL WINAPI Shell_NotifyIconW(DWORD dwMessage, PNOTIFYICONDATAW 
lpData);
#ifdef UNICODE
#define Shell_NotifyIcon  Shell_NotifyIconW
#else
#define Shell_NotifyIcon  Shell_NotifyIconA
#endif // !UNICODE

////
//// End Tray Notification Icons
////

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