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dfStrCHK()
Calculates a string CHECKSUM
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Syntax:

     dfStrCHK( <cStr> ) --> nChecksum

Parameters:

     <cStr>     Input string

Returns:

     <nChecksum> String CHECKSUM

Description:

     Calculates a string's checksum

Example:

     dfStrCHK( "dBsee" )    // RETURN 483
     dfStrCHK( "dBsee 4"  ) // RETURN 567

See also:

     dfCmpNum(), dfLen()