Do NOT buy the IOGear MiniView unit mentioned below. It is not 100% Mac compatible. 1) with keyboard & mouse plugged into the front-side USB ports, NONE of the Mac special startup keys work. eg, no cmd-S single user mode, no Option key for startup drive select, no shift key for safe-boot mode, etc. 2) with the keyboard & mouse plugged into the rear USB ports, the special keys do work, but power-on and cmd-opt-esc do NOT work, and remote computers can NOT be controlled. In fact, do not get ANY unit that has on-screen display/switching capability. These use an internal ROM to detect special keys, and are tailored to Windows, and reject Mac special keys. I have had one of these units for a while now, and I need 2 keyboards to get full Mac functionality. IOGear blames it on Mac USB, which is pure BS. Everything works from USB, just depends on front-side/back-side ports, but they ignore that fact. They would not refund my money either. A USB KVM is going to be easier & cheaper to find, but you'll need to add a USB card to your 6100. Sean >I have an iogear 4 port USB KVM. I use it to switch between 2 macs >and 2 PCs. Works ok only problem I've found is that for some reason >the computers can not sense what type of mouse I have plugged in to >the USB mouse port. The KVM also had a 3rd USB port in the back for >peripherals which does let the computer detect the mouse type. >Unfortunately when I switch computers the computer sees the mouse as >being disconnected. Kinda defeating one of the purposes of the KVM >(making the comps think the mouse and keyboard are still connected). >Other then that I've had no other complaints with it. The link below >is to a newer version of the one I have so maybe that problem is fixed. > >http://www.iogear.com/main.php?loc=product&Item=GCS1714 >