where is the $vbulletin->GPC[] array set up?

[StephenKay]

Uhmmm... thanks, but for example, say that I want to add a variable to the string:

showthread.php?goto=newpost&t=XXXXX

such that it would be:

showthread.php?goto=newpost&t=XXXXX&translate=en_fr

In the showthread.php code, they do things like:

PHP Code:

switch($vbulletin->GPC['goto'])
{
    case 'newpost': 


...so I am wondering how to get my variable into that array, or is there some other way I should be trying to read this...