One USB-PS/2 console controls 16 computers; Cascade up to 2 levels - control up to 256 computers; Dual Interface - supports computers with PS/2 or USB keyboards and mice; Multiplatform support - Windows 2000/XP/Vista, Linux, Mac, and Sun; Video DynaSync™ - Exclusive ATEN technology eliminates boot-up display problems and optimizes resolution when switching between ports; Auto PS/2 and USB interface detection; USB or PS/2 keyboard and mouse emulation - computers boot even when the console focus is elsewhere; Superior video quality - up to 2048 x 1536 -- DDC2B; Computer selection via front panel pushbuttons, hotkeys and multilingual on-screen display (OSD) menu; Two level password security - only authorized users view and control computers; up to four users and an administrator with a separate profile for each; Auto Scan feature for monitoring user-selected computers; Hot pluggable - add or remove computers without having to power down the switch; Buzzer on/off via hotkey and OSD; Firmware upgradeable; No software installation required; Designed for desktop or rack mount (19" system rack, 1U)