MI - MBO/MBX/MBP??

[SOLOMON ISLANDS POPULATION CENSUS]

Hello, greetings from the Solomons,   I have been writing a few MapBasic programs for village searches and data checking/updating  for the village tables we have here. One, which works fine, creates a menu, depending on the item selected from the menu another .mbx is run to find the input village etc.   I was adapting this for another purpose, but found when I compiled the code it created an *.mbo file, not an .mbx file which is what I was expecting. I compared the two code listings and the I had not  inserted the:   Sub exit_menu      '** Restore default menubar    Create Menu Bar as Default      '** Exit this application    Terminate Application "menu.mbx"   End Sub   Having inserted this it works fine. The on line help gives me the following:   "If the file compiles successfully, MapBasic creates a filename.MBX file (if the file is a stand-alone program) or a filename.MBO file (if the file is part of a multiple-module project). If the file generates compilation errors, MapBasic displays a list of error messages at the bottom of the edit window"   At the moment, the nature of my relatively simple programs means that I can do what I want to do without setting up a multi module project, I do however remain slightly confused by the differences between MBX/MBO/MBP and how they all fit together etc. and would be interested in any pointers as to when this multi-module approach would be worth me exploring further.   Thanks in advance   Mick Saunders