Moving to the back of the projector we have all the inputs and outputs. And let me say there are a lot. Starting from the upper left you have a USB Type A port, then a LAN port. To the right of that you have a HDMI port. For monitor out you have a 15pin VGA port and then two VGA 15pin inputs so you can input two computers at the same time. Going down one level you will see a remote control signal receiver and then a standard power connector slightly to the right and below. Moving back up we have serial port for command and control and then an audio out 3.5mm mini dimm port. You will also find two audio out mini dimm that correspond to input 1 and 2 of the VGA ports. If you have a L/R audio input cable then the XJ-ST155 has two ports for that. This projector also comes with a composite video input and a s-video input as well. Last but not least you have a USB-B port for controlling the projector with the optional interactive pointer. As is expected you can lock the projector down as well since it has a Kensington lock hole near the power input.
Setting up the projector will require a little more planning than most since it is heavy. Mounting of the projector on a table should be very easy and straight forward, but keep in mind you will need to place the projector fairly close to the screen since it is a short throw projector. This is assuming you are hoping to project a 70" to 100" diagonal image. The range is a 60 inch diagonal from 2.64 ft and a 100 inch diagonal from 4.62 ft. The projector has three adjustable feet so as long as the table or stand is fairly level, you should be able to achieve a nice square image without using keystone correction. Using keystone correction degrades image quality. The feet are positioned in triangle formation. One in the front and two in the rear.
If you ceiling mount the projector then it is best to have it done by a professional. It is heavier than most projectors and does require special retrofitting to support the weight. Not to mention that you have to be precise in your distant calculations to get the image to fit your desired screen size. There is no zoom adjustment. Just a focus lever.
The menus are extensive and well laid out. Accessing each is very easy and each of the features was well described. An IT person who is familiar with projectors will more than likely appreciate all the different settings you can change to achieve the command and control most system administrators need.