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PROBLEM SOLVED!!!!!!!!!!
I went to the mainfile.php and switched the XOOPS_DB_PCONNECT flag from 0 to 1.
OK, back in business, thanks for helping, and I even learnt some new xoopscode. One question:
$uid = 10;
$member_handler =& xoops_gethandler('member');
$user =& $member_handler->getUser($uid);
$uname = $user->getVar('uname');
... is more code to write than...
$uid = 10;
$user = new XoopsUser($uid);
$uname = $user->getVar('uname');
... but should I do it anyway? Does the latter way put a heavier load on the server?