Help] When I want to know pointer of item in list...

[Woo-Sick Choi <wschoi sr hei co kr>]

Hi~

I have many list items.
I will display these items and select items for using multiple.

In this case, How can I know that
1) How many items be selected...
2) Which item be selected...
3) The String of item was selected...
4) How Can I count position of items in list...

Thanks...