It allows the user to build structures from various libraries or read structures for the user to manipulate.
Specific help is located in the other help files.
Pick the number of strands by clicking the left mouse button over the appropriate box. Pick the general form the same way. This causes the program to exit. The unit controls allow the user to alter Dx,Dy,Dz, tilt,roll,and twist. The affect controls whether a change is compensated for in the next unit, or whether the remaining part of the helix is altered.