Calling convention: Copy(Value: String, Index: Integer, Count: Integer): String
Description: Returns a substring containing at most Count characters, starting at the one-based position Index.
Parameters:
Value = Source string.
Index = One-based starting position.
Count = Maximum number of characters to return.
Returns: String: requested substring; NULL if any parameter is NULL.
Availability: Default.
Example:
Result := Copy("abcdef", 2, 3); // "bcd"