Main Screen
Description of the buttons in vertex part:
  ADD VERTEX        Adds new vertex at the coordinate the cursor is.
  DEL VERTEX        Removes the selected vertices unless they belong
                    to a face.
 
Description of the buttons in Face part:
  MAKE FACE         Creates a face from the selected vertices. There must
                    be either 3 or 4 selected vertices.
  DEL FACE          Deletes the selected faces. The vertices of the face
                    are not deleted.
  FACE PROP         Shows the Face Properties-menu.
  INV. NORMAL       Inverts the normal vectors of the selected faces.
  TWIST1, TWIST2    Helps to fix the possible self-intersecting faces.
 
Description of the buttons in Object part:
  CENTER OBJECT     Centers the whole object around the 3D-cursor.
  FLIP              Mirrors the object around the X, Y or Z-axis.
  IMPORT OBJECT     Brings another object to be part of this object. Textures
                    are not imported.
  
Description of the buttons in Texture part:
  TEXTURE MANAGER   Opens the Texture Manager menu.
  
General buttons:
  LOAD              Loads the object from file
  SAVE              Saves the object to file
  PREFS             Shows the Preferences screen
  CLEAR             Clears the current object and optionally the textureset
  HELP              Shows this page
  EXIT              Quits the program
  
