[. . . ] Aivia MK550 is equipped with three different levels of elastic force, touch and slide volume control, 20 non-Ghosting keystroke capability and GHOSTTM Macro Engine. 0 Port x 1 40 MB of free hard disk space Windows XP / Vista / Vista 64bits / Windows 7 / Windows 7 64bits Step 1 Plug USB connector into either desktop or laptop's USB port Step 2 Open "Control Panel" "System" confirm the keyboard is working properly Before installing the driver of MK550, we suggest checking whether any other keyboard drivers have been previously installed on your system. [. . . ] If yes, in order to prevent possible conflict, please un-install or remove them before installing MK550 driver. Step 1 Please insert the driver CD into CD-ROM, you will see LOGITECH CD main menu. exe") Step 2 Click "GhostTM Engine Installation" button to start GhostTM Engine installation. 3 Touch and slide volume control area: Built-in touch sensor with mute key and six levels of audio volume. Tip Keep sensor from far right or far left pressed, volume will increase or decrease linearly. 0 HUB Backlight On/OFF switch: Press this button to switch backlight On/OFF Win Luck: Prevent Windows key from interrupting game operation. Drag one icon (Ex: Macro One) from Macro Scripts then drop in Profile two- Macro four. When finish dropping icon, please close or minimize the GhostTM Engine. Before editing Macro key, please set up the command of Macro Setting Panel, then press Record button to start Macro Editing. After you finish editing the Macro Editing Note, you can drag& drop icons from the Quick Insert Bar to further modify it. For the special command of folder and website address, please select one icon to drag& drop into Macro Editing Note setting. When you finish a Macro setting process, please keep pressing the left button in the Macro Editing Note to drag & drop into Macro Scripts to define a Macro script. [. . . ] When you finish a Macro setting process, please keep pressing the left button in the Macro Editing Note to drag & drop into Macro Scripts to define a Macro script. System will automatically name a number code for this new Macro script. [. . . ]