[key] is for the key combination that you must press to acsess the accesskeys in your browser.
Chrome, Safari, IE: [alt], Firefox: [alt][shift]
Chrome, Firefox, Safari: [ctrl][alt]
You can switch between the links with the tab-key.
Use the arrow-key to change tabs, tab menues and galleriers.
You can open a link by pressing the enter/return-key.
You can adjust the zoom factor by using Strg +/-