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Make sure reference count of string is 1
Source position: systemh.inc line 1132
| procedure UniqueString( | 
| var S: RawByteString | 
| ); | 
| var S: UnicodeString | 
| ); | 
| var S: WideString | 
| ); | 
UniqueString ensures that the ansistring S has reference count 1. It makes a copy of S if this is necesary, and returns the copy in S
None.