Traybook equips toolbook with an icon in the systray area on the taskbar. The icon is controlled using OpenScript. It features a sample of how to change the tip (pop-up text) and how to translate it;'s window messages so you can have contextmenus on the trayicon. The result of the menus (which are stored as resource inside toolbook) is handled by toolbook messages, just like normal menus. To remove the main icon from the taskbar it's neccesary to hide the mainwindow instead of minimizing it (otherwise it will still have a large icon). A sample of that is also in the TrayBook.
TrayBook hasn' t been tested yet under windows NT 4, but runs fine under windows 95 osr2 with IE4.01 with shell extension.