You may never have heard of MELT (Myofascial Energetic Length Technique). One of its components is a hand treatment which can have an impact on the hands but also moves up along myofascial lines and is often helpful with neck and shoulder problems. It can be done at your desk because you use small balls in a prescribed sequence. You can purchase this entire set (which includes a DVD, the balls and instructions) by going to www.meltmethod.com.
I am a trainer certified in MELT and have seen positive results when people use is regularly. I myself often use those balls for my hands when I have been at my computer for a long time. Note: it also has a sequence for the feet.
I wish you good luck