Recommendation
In the DDE protocol, it is recommended that every server supports a topic where clients can get information about the server.
The system server supports this topic under the recommended topic name "System".
This topic only handles the data format CF_TEXT.
Items available
The following items exist in the topic.
|
Item name |
Description |
|
SysItem |
Returns the names of all supported item names under this topic. |
|
Topic |
Returns the names of all topics in the server. In this case, "IGSS_ELEM" is listed as one symbolic topic name representing all objects in the configuration. This is because it will take too much time to list all object names. |
|
ReturnMessage |
This server will always return the string: "No further information". In some servers, it will return detailed information about the server state. |
|
Status |
Returns the server state. This can be "Ready" or "Busy". |
|
Formats |
Returns the list of supported data formats. In this server, it is CF_TEXT and XlTable. |
|
Help |
Returns a short help text explaining how to access the server. |
|
TopicItemList |
Not supported |
All items returning lists will return a string with all the list entries delimited by tabs. This will work whether data collection is active or not.