CONVCONTEXT    
The CONVCONTEXT
structure contains information supplied by a DDE client application. The
information is useful for specialized or cross-language DDE conversations. 
typedef struct tagCONVCONTEXT {    // cc 
    UINT  cb; 
    UINT  wFlags; 
    UINT  wCountryID; 
    int   iCodePage; 
    DWORD
dwLangID; 
    DWORD
dwSecurity; 
   
SECURITY_QUALITY_OF_SERVICE qos; 
// client side's quality of service 
} CONVCONTEXT; 
 
Members
cb
Specifies the
structure s size, in bytes. 
wFlags
Specifies
conversation context flags. Currently, no flags are defined for this member. 
wCountryID
Specifies the
country-code identifier for topic-name and item-name strings. 
iCodePage
Specifies the
code page for topic-name and item-name strings. Non-multilingual clients should
set this member to CP_WINANSI. Unicode clients should set this value to
CP_WINUNICODE. 
dwLangID
Specifies the
language identifier for topic-name and item-name strings. 
dwSecurity
Specifies a
private (application-defined) security code. 
qos
Specifies the
quality of service a DDE client wants from the system during a given
conversation. The quality of service level specified lasts for the duration of
the conversation. It cannot be changed once the conversation is started.