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   A Check Box control is used when the symbol associated to the control can
   assume only two mutually exclusive values (ex. Paid/Not Paid, True/False).

   It is recommended that the check mark appears in the Check Box in
   correspondce to the on value of the element. For instance, supposing
   that a Check box is used to assign a value to the SelHW field (Sells
   Hardware) in a database representing sales points. It is more logical that
   the check mark in the Check box corresponds to "Yes", in other words it is
   true that the store sells hardware.

   Among the properties of a Check box, the Function on selection
   parameter allows for specifying the function that is to be executed when
   the Check box is "checked".

Example:

   In an articles management, the field ExiArt (Article Existence) of the
   Art file (Articles) specifies if the current article is present in the
   warehouse. If the article is present, the ArtExi field must assume the
   value of "1", otherwise it will assume "0". Instead of using a
   Spin or Radio button, a Check box is used, handling the two values. Once
   the Check Box is inserted, the parameters in the properties environment
   must be set. These parameters are:

     
     Origin type...........: Field
     
     Check Box data origin.: ExiArt
     
     Default value.........: "1"
     
     Value in on...........: "1"
     
     Value in off..........: "0"