windows messages

Hi forum members, I 'm checking what kind of windows messages generates a common user, with WH_GETMESSAGE hook, but this hook only give the number of the message, some of the message I had identified for example the message WM_SYSKEYUP is the number 261, but all the messages I haven't already identified, for example , I don't know , what do mean the   280,260,537,1203,49312,49313,49194 messages, do you have some idea about these messages   Please help me

Thanks in advance