The optional stored, default, and nodefault directives are called storage specifiers. They have no effect on program behavior, but control the way runtime type information (RTTI) is maintained. Specifically, storage specifiers determine whether or not to save the values of published properties in form files.
The stored directive must be followed by True, False, the name of a Boolean field, or the name of a parameterless method that returns a Boolean value. For example,

property Name: TComponentName read FName write SetName stored False;

If a property has no stored directive, it is treated as if stored True were specified.
The default directive must be followed by a constant of the same type as the property. For example,

property Tag: Longint read FTag write FTag default 0;

To override an inherited default value without specifying a new one, use the nodefault directive. The default and nodefault directives are supported only for ordinal types and for set types, provided the upper and lower bounds of the set뭩 base type have ordinal values between 0 and 31; if such a property is declared without default or nodefault, it is treated as if nodefault were specified. For reals, pointers, and strings, there is an implicit default value of 0, nil, and '' (the empty string), respectively.

When saving a component뭩 state, the storage specifiers of the component뭩 published properties are checked. If a property뭩 current value is different from its default value (or if there is no default value) and the stored specifier is True, then the property뭩 value is saved. Otherwise, the property뭩 value is not saved.

Note:        Storage specifiers are not supported for array properties. The default directive has a different meaning when used in an array property declaration. See Array properties.

ps: 도움말 찾는 습관을 들입시다

님의 충고대로 도움말을 참조해서 알게 되었습니다.
감사함다.. ^^;;