Shoutbox

there's a couple of questions how do I know the hex value?
for example I looked at msdn for WM_MOVE and it says it is equal to &H3 what does that mean?.
and also to get HIWORD/LOWORD does

code:

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WORD LOWORD(DWORD Value);

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or

code:

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WORD HiWORD(DWORD Value);

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works?
and lastly at the Message Notification event what do I write at the if(Message==?)