The Marker tool simulates drawing with a magic marker or felt-tip pen.
To use this tool...
Once you have selected the colours you wish to draw with, click on the Marker button and place the cursor where you wish to start drawing. Press and hold the left mouse button to draw with the foreground colour; hold down the right mouse button to draw with the background colour. Draw with the marker by moving the mouse. To change the size of the marker, double click on the Marker button.