Motion search is activated by clicking the ``Masked search'' button on the viewer controls window. You can now use the mouse to draw an area, in which motion will be searched for, on the camera images. You can draw these areas for several cameras at a time. The left mouse button does masking, while the right button erases it.
When the area has been masked, press play. If you want a less accurate (but faster) search, use fast forward/rewind. This way, however, an individual image with motion may pass unnoticed.
When an image with motion in the masked area has been found, you will hear a beep and the replay will pause.