Thanks for the reply!!!
My scenario is:
Once user will click the context menu(custom action) after selecting items in qSIListView, I want user input to select the person name to whom they want to assign.
After that, I want to update all those selected items with the person name selected in external list.(I have a field in the external list to store ID of the Person)
Now, if I use Goto URL (and pass the custom made webpage where there is a people picker to select person name), how would pass the Items selected in the parameter?