describes all items of a DDE connection used in formulas.
A DDE connection consists of the DDE service name, the DDE topic and a
list of DDE items which may contain results cached from the last update.
The formula that would need this information for example would contain
=[1]!'R1C1' or =[2]!'Sheet1.A1' where
[1] is an external link with DDE service name "excel" and the
topic "X:\PATH\[FILE.XLSX]Sheet1", and [2] contains service
"soffice" and topic "file:///X:/PATH/FILE.ODS". The service name is stored
in Service, the topic is stored in
Topic. Note that if the DDE item contains
single quotes they are escaped by doubling them, as usual, for example
=[2]!'''Sheet name''.A1' in a "soffice" service.
