Correct DSE assessment can help to manage this as can regular breaks to take (such as going for a walk) a walk.
Mark provides hands on treatment to help reduce the (neck or) back pain (many people experience)and also gives advice on simple exercises to help reduce the impact of sitting for long periods of time on the body.
The treatment will be aimed at promoting blood flow to the effected tissues which maybe casing the discomfort and mobilising the joints which may well have stiffened up as result of the long term sitting.