How to find out if a document is already saved (Found, and I was so reckless)

How to find out if a document is already saved using formula language

Ans :- I should have used @isnewdoc, before posting the Question

Subject: How to find out if a document is already saved

what you want to find ? if document then call it by unid or always create a unique number for each document and call it by this number. for more chat me on ajitnarayan123@gmail.com