Using System Topic Data Items

Applications that provide a DDE interface should also provide a special topic SYSTEM. This topic provides a context for items of information that might be of general interest to an application. The SYSTEM topic for Personal Communications contains these associated data items:
Item Function
Formats Returns the list of clipboard formats (numbers) that Personal Communications is capable of rendering.
Status Returns information about the status of each Personal Communications session.
SysCon Returns the level of Personal Communications support and other system related values.
SysItems Returns the list of data items that are available when connected to the Personal Communications system topic.
Topics Returns the list of Personal Communications topics that are available.