You can also change the position of the department node in the adjacency graph directly by moving the cursor onto the node symbol of the department you want to move and then pressing and holding down the left button of the mouse. The department node will then track or follow the cursor as long as you keep the left button of the mouse depressed. To stop dragging the department node release the left button of the mouse. The department node will be placed in the nearest vertex position of the hexagonal adjacency graph if this position is unoccupied by another department. If you drag the department node outside the world coordinate boundary box or if its new vertex position is occupied, then the department node will be returned to its original location.