HideWin sits in the system tray and enables you to hide any top-level window with its popup tray menu or an ALT+letter hotkey that it assigns automatically. It appears...
HideWin sits in the system tray and enables you to hide any toplevel window with its popup tray menu or an ALT+letter hotkey that it assigns automatically. It appears to be abandonware, but it is only 13KB and still works.
Productivity Developer Tools Utilities
portable Discontinued window-manager desktop-enhancement minimize-to-tray hide-window hide-all-windows