Property Implementation

BEGIN_PROPERTY Begins the implementation of a property.
END_PROPERTY Ends the implementation of a property.
PLENGTH Returns the length of the string value the property must be set to.
PROP Returns a pointer to the value the property must be set to.
PSTRING Returns the address of the string value the property must be set to.
READ_PROPERTY Returns if the property implementation was called for reading.
VPROP Returns the value the property must be set to.