Do you want hide app's from taskbar?.... from trayicon?.... from taskmanager?...
if you want hide app's from taskbar you need open your code of the proyect and write this code:
Application.MainFormOnTaskbar := False;
If you want hide app's from taskbar you need select your trayicon and put the value in false of the property visible.
.... and about the taskmanager, i understand what do you want.