I use the two USB ports at the
front of the Rackmac Mini to connect the keyboard/mouse to the Mac
(and a USB stick or an iLok for example). There are even more USB
ports in the rack panel above the XITE-1. Some of these are
connected to the Mac Mini and the other ones to a USB hub that is
attached to the iConnectMIDI 4+ (for MIDI controllers). There are
also some Ethernet ports in the panel. Both the USB and Ethernet
ports are actually just Neutrik feed-through connectors.