So z.B.
Code:
ShowWindow(Application.Handle,SW_HIDE);
Oder, wie Luckie sagen würde: Stil auf "bsToolWindow" einstellen.
Code:
SetWindowLong(Application.Handle,
GWL_EXSTYLE,
GetWindowLong(Application.Handle,GWL_EXSTYLE) or
WS_EX_TOOLWINDOW and not WS_EX_APPWINDOW);