What is Hide-It?
Hide-it allows you to hide any application window and it's button in the taskbar, the application is also removed from the Alt-Tab chain, so it won't disturb your task switching, it's just as if it wasn't there. You can later access it's window un-hiding it, you just need to right-click in the small Hide-it's icon in the system tray area and select it.
The last version is 1.1 , released on March 1996. See http://www.expocenter.com/hideit/