nAnd( nValue1, nValue2, ...nValueN )-> <nResult>
------------------------------------------------------------------------------


 PARAMETER:

  <nValue1>      Is a ( long ) numerical mask value to be ANDed bitwise with
                 other long values

  <nValue2..n >  More long values to be ANDded 


 RETURNS:

  <nResult> is the result of all given and bitwise ANDded values



 DESCRIPTION:

  nAnd() performs a bitwise AND on every given numeric argument. This is
  neccessary if you want to generate a combinded value from different
  constants, like it is done for Windows's magic style numbers.
  Lets assume that you have coded a control of which its behaviour can be
  set via numeric constants:

       Constant    Binary    Decimal       
       C_VISIBLE     0001         1
       C_OWNER       0010         2    
       C_ACTIVE      0100         4
   
       C_MASK        0111         7  


  Just a little remembering: only 1 AND 1 = 1, all other combinations,
  like 1 AND 0, 0 AND 1, 0 AND 0 will be zero ! So, to generate the style
  value, just nAnd() all values with a given mask constant, where all the
  bits are set high ( C_MASK ):


    +--------------------------------------------------------------+
    |  /* Generate Style value */                                  |
    |   nStyle := nAnd( C_MASK, C_VISIBLE, C_ACTIVE ) // -> 0101b  |
    +--------------------------------------------------------------+


   In this Example, the style flag would be 0101b, which is 5 decimal. This
   way, you can store a lot of informations in one numerical variable ! 

 SOURCE:

  SOURCE\FUNCTION\OR.C