Determining if MSN Is in the Sign-in State

The following code example shows the usage of a mutex object to determine if MSN Explorer is signed in. When you have finished using the handle, be sure to call the CloseHandle function.

    HANDLE hMSNSignedInMutex;

    hMSNSignedInMutex = OpenMutex(SYNCHRONIZE, FALSE, 
        "{ECCC50B5-064B-4693-B104-925714A4C74B}");

    if (hMSNSignedInMutex != NULL)
    {
        // MSN Explorer is signed in
    }