#include <Windows.h>

HDDEDATA CALLBACK DdeCallback(UINT uType, UINT uFmt, HCONV hconv, HSZ hsz1, HSZ hsz2, HDDEDATA hdata, ULONG_PTR dwData1, ULONG_PTR dwData2)
{
    return 0;
}

int main(int argc, char *argv[])
{
    DWORD idInst = 0;

    UINT result = DdeInitialize(&idInst, &DdeCallback, APPCLASS_STANDARD | APPCMD_CLIENTONLY, 0);

    if (result != DMLERR_NO_ERROR)
        return result;

    HSZ hszService = DdeCreateStringHandle(idInst, L"AcroViewR11", CP_ACP);
    HSZ hszTopic = DdeCreateStringHandle(idInst, L"control", CP_ACP);

    HCONV hConv = DdeConnect(idInst, hszService, hszTopic, NULL); // blocks for ~30sec when Hey Cortana is enabled

    if (hConv != NULL)
        DdeDisconnect(hConv);

    DdeFreeStringHandle(idInst, hszService);
    DdeFreeStringHandle(idInst, hszTopic);
    DdeUninitialize(idInst);
}