I have a flow it first starts with a  non-wicket   external resource (EXT) , 
from here user has an option to call  my page  (Form1) which should
prepopulate Form1 .  Form1   is usually accessed through a link in my home
page , but this scenario i am describing is a new one and to implement this
i don't want to disturb or change existing code , so to facilitate this new
call , I am thinking of sending the request from   EXT to a redirect page
where I will save all  parameters  from EXT submit and redirect to Form1  ,
here in Form1 onBeforeRender() method ( which is free and I can override it
for this new  behavior ), I want to retrieve the  caller of this page and if
it is from redirect page (as I mentioned above) get the particular instance
of redirect page which redirected to this and retrieve the posted data  is
it possible ?   Is it possible to retrieve a particular instance of a page
without any identifier  like 
page1   redirected to page 2 and in page 2 can I get who initiated page 2 ie
page 1 instance  ?
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