Вот цитата из справки, где всё написано
| Код |
//When you declare routines that take short-string parameters, you cannot include length specifiers in the parameter declarations. That is, the declaration
procedure Check(S: string[20]); // syntax error
//causes a compilation error. But
type TString20 = string[20];
procedure Check(S: TString20);
//is valid. The special identifier OpenString can be used to declare routines that take short-string parameters of varying length:
procedure Check(S: OpenString);
//When the {$H-} and {$P+} compiler directives are both in effect, the reserved word string is equivalent to OpenString in parameter declarations.
//Short strings, OpenString, $H, and $P are supported for backward compatibility only. In new code, you can avoid these considerations by using long strings.
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