In this direction, I'm trying to call a function in the shell32.dll lib that apparently should let you minimize an app to the system tray, but I'm not having much luck... I guess I don't really understand what am I exactly doing.

This is what I found in the MSDN:

BOOL Shell_NotifyIcon(
�� _In_ ��DWORD dwMessage,
�� _In_ ��PNOTIFYICONDATA lpdata
);

So, I tried to translate this into Pharo as:

MyClass >> minimizeToTray: dwMessage data: lpData

�� <apicall: bool 'Shell_NotifyIcon' (dword PNOTIFYICONDATA) module: 'shell32.dll'>

But it won't let me save the method, reporting it's expecting an argument before PNOTIFYICONDATA.

I realize PNOTIFYICONDATA is not a primitive type, but I just don't know how to handle it... :(