Difference between adding a unit to the interface or the implementation section

Question

If I have a unit that is filled with constants like...

unit AConsts;
interface
const
   Const1 : WideString = \'Const1\';
   Const2 : WideString = \'Const2\'         


        

Answer 1

I put all references in the implementation section and only put those unit names in the interface that I have to.

I like to limit the scope of everything as much as possible, though, and this policy is pursuant to that.