Marker pens are a slightly wet medium, though generally not wet enough
to interact with other wet media. As applied by the Marker tool 
, its pigment goes on the canvas with a multiply function
when using pens, simulating the interaction of using a pen repeatedly
on the same spot. An imperfect hue will tend towards a different color,
very similar to the behavior of standard markers.
Marker ink tends to be semi-transparent, and can get darker when applied with more pressure. Bristling generally does not occur since pen tips tend to be firm or solid even if soft. Pens generally have a very sharp fall-off at the stroke edge, and generally there is full canvas penetration even at light pressure.
Marker tool options include:
Shape: Choices include Round or Square.
Size: Defines the size of the tool head in pixels. Note that you can also adjust the Size setting via the keyboard.
Thickness: Defines the aspect ratio of the tool head.
Rotation: Defines the angle of head rotation in degrees
Head Tracking: Controls whether the tool head bends around the path of the user’s stroke, or remains at a fixed angle.
Trace check box: When marked, the Marker tool will select the pigment color by sampling the data below the center of the tool regardless of the layer type. (This feature works much the same way the Clone Brush's Sample Merged tool option works). When you hold down the mouse button to begin the stroke, note that a single sample is performed, and the resulting color is used for the duration of the stroke.
Like other Paint Shop Pro tools, the Marker tool comes with presets. To use a preset:
In the Tool Options palette, click the Presets button. This displays a list of preset styles.
From the list, choose the desired tool preset.