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 logical             Logical constants
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 Syntax
   .f.
   .t.

 Arguments
   None.

 Description
   Logical constants are used to express the false and true conditions.
   The internal numeric representation of .f. and .t. is zero and non-zero,
   respectively.

 Example
   #define EXAMPLE_CONSTANT
   #include example.hdr

   proc Test_logical
   ? .f.
   ? .t.
   cursor( .f. )     // using logical constants as function parameters
   cursor( .t. )
   endproc

   proc main
   Test_logical()
   endproc