questions about do= --- a href

[patoche17]

good morning


I have two questions for learning vbulletin code..

<a href="private.php ==> which kind of pages, I can write after < a href=??>




do=newpm&userid[]=338&userid[]=7&userid[]=8&userid[]=1" ==> Wich kind of actions I can write after do=??


or where can I find these answers??


thanks a lot from PAris