handling GUI events (button clicks, etc)

I'm a relative newbie to NSIS and thought I've spent a while searching for an answer to this I'm not coming up with anything. I'd like to be able to add a button to an installer page that would programatically select or deselect all items in a (long) list on that page. Is this possible?

Ok, on further searching I did find references to the testnotify.nsi example script, which sounds like it should enable event handling. I'll look at that. I guess the question that remains is whether (and how) I can set the selection state of the items in the list.

assuming you are talking about a listbox, call SendMessage with LB_SETSEL in a loop ( http://msdn.microsoft.com/library/de.../lb_setsel.asp ) or use LB_SELITEMRANGEEX

I get it. So bottom line is that *all* this kind of GUI interaction is accomplished by using SendMessage to get the OS to do the work. Makes sense, I suppose. I mean, NSIS isn't supposed to be Visual Basic.

Thanks for your help.

well, anything more advanced than SendMessage/ShowWindow/EnableWindow you need to use the system plugin, then you can call any api