Property :: appendResult - Append string to result

In order to pass result from a context action to the calling function, the result might be stored in the property handle result area (String). The function appends the string passed to the result already stored (see also result property).

Since the property handle result area is used by other functions as well, it is, however, more save using the context result area for returning result strings.

The property throws an exception, when the property handle is not valid.