This is a real time command that can be used to draw an arbitrary line in a workspace.
There is an option to get this working in the post processing (Signals and Events) tab.
Animated_Line /SIGNAL_TYPES=TARGET+TARGET /SIGNAL_FOLDER=ORIGINAL+ORIGINAL /SIGNAL_NAMES=CLAV+CV7 ! /LINE_WIDTH=2.0 ! /LINE_COLOR=#FFFFFF ! /DRAW_AS_CYLINDER=FALSE ;
A line will automatically be drawn in the 3D viewer.
NOTE: You can close the Biofeedback Post Processing dialog and the line will still be drawn.