cancel backgroundworker from a separate form

Hi Experts,
 
i'm very new at VB and here is my dilema, i have form A that calls a backgroundwoeker to run a very long process. once the user clicks on submit on form A it calls the BGworker and opens form B.

 on form B load i'm closing form A - form B has a progress bar, a cancel button and other info i display to the user what i'm stuck is with the cancel button - how can i have form B send a cancelationrequest to the backgroundworker.

 Also if not too much to ask - how can i catch progresschangeevents and workercompleted events in form B

Many thanks in advance.