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   The Exclude button allows to remove the selected object in both the
   make script file and the current sub-project.

   If the entity is added by using the Include button, and therefore it
   does not make part of the current sub-project, it is simply removed from
   the make script.

   But if the entity makes part of the current sub-project, it is not only
   removed from the make and link script, but also from the sub-project
   itself. Pay much attention when using this button in order to avoid
   undesired deletions.