I tried to understand what exactly different constant values mean,
especially the subtle differences among olOffline, olCachedOffline,
olDisconnected, olCachedDisconnected, and differences among
olCachedConnectedHeaders, olCachedConnectedDrizzle, olCachedConnectedFull,
olOnline.

olNoExchange = 0,

olOffline = 100,

olCachedOffline = 200,

olDisconnected = 300,

olCachedDisconnected = 400,

olCachedConnectedHeaders = 500,

olCachedConnectedDrizzle = 600,

olCachedConnectedFull = 700,

olOnline = 800

Anyone knows?