Pop-up Menus
  Bookreader contains pop-up menus that give you quick, di-
  rect access to commands and functions.  The pop-up menus
  duplicate some of the menu items available on the pull-down
  menus.
  To display a pop-up menu and perform a function:
  1.   Press and hold MB3 in the work area of a window.  A
      pop-up menu appears.
  2.   Drag to the menu item you want.
  3.   Release MB3.
  Additional topics:
  *   Using Menus, Controls, and Dialog Boxes
  *   Bookreader Help Topics