setting user options

[squishi]

Is there a tutorial on how to change a user's options?

Let's take this code for example:

PHP Code:

    $db->query("UPDATE " . TABLE_PREFIX . "user SET options= options - 16 WHERE (options & 16) AND userid=" . $vbulletin->userinfo['userid']); 

I have no idea what it really means.
Isn't there a lookup table that could tell me what the user options translate to?
for example:
options = '45096150'