Create or select a biped. > Motion panel > Motion Capture rollout > Show Markers button
The Marker Display dialog lets you specify how markers from .csm files are displayed in the viewports. For further information on markers and .csm files, see Character Studio Marker Files.

Show Recognized Markers—When on, displays the markers that character studio recognizes.
Show Prop Markers—Enables the display of markers on prop bones.
Show Unrecognized Markers—Displays the markers that character studio does not recognize.