delphi中rewrite如何用的

delphi中rewrite怎么用的啊
delphi中rewrite怎么用的啊，参数到底怎么回事啊，郁闷

[解决办法]
var
f: TextFile;
begin
AssignFile(f, 'c:\ww.txt ');
rewrite(f);
closefile(f);
end;