The HSZPAIR structure contains a DDE service name and topic name. A DDE server application can use this structure during an XTYP_WILDCONNECT transaction to enumerate the service-topic pairs that it supports.
typedef struct tagHSZPAIR { // hp
HSZ hszSvc;
HSZ hszTopic;
} HSZPAIR;
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in ddeml.h.
Dynamic Data Exchange Overview, Dynamic Data Exchange Structures