want to ask about robotic arm movement

Question

hello everybody

i m so confused for my final year project, i have not  got any solution for moving robotic arm to x,y,z coordinates yet. i want to make my robotic arm behave as a teacher i.e: writing alphabets on board. and i want to send signal through parallel port to the robotic arm so that robotic arm move to x,y,z axes according to the signal it acquired.

how can it be possible through c sharp

kindly help me out

i would be grateful to u

regards

ned_learner