The "Help" pulldown menu:

The "On version" button give you information about the version of the program laueX you are running:

Version 1.0

"On axes" explains the geometry of the axes, as given in the paragraph "The set of axes".
The "On detector" button explains how the position of the detector is defined (see the paragraph describing the "Detector" button in the "Data" menu).
The "General" button works only if a "WEB browser" such as Mosaic or Netscape is installed on your computer, and defined in the laue.h file before compiling the program. In such case you will have access to all the html documentation.