getResponseAttachmentAttrNames
Returns the list of the attribute names of the parts in a multipart response.
General format
void getResponseAttachmentAttrNames( id, attrNames )
Syntax rules
1. id and attrNames are alphanumeric data items.
General rules
1. id can be extracted from the list returned by getResponseAttachmentIDs.
2. attrNames is filled with the list of attribute names. Names are separated by comma.