form numbering

hi

is it possible to assign an incremental number for each time form is open? (variable, recall, hidden, calculation...) and this value will be save as a new form variable (if form is submitted)

cases of use: each form has a order id (shopping order), or a ticket id (support ticket), or a quote id (quote request), or a lottery id (raffle ticket), or entrance id (event registration),... 

easiest example: the first time a form is open (no submission) form has a variable=1; the second time has a variable=2;… and so on

it would be great idea if we can recall an a default intern variable named “open_counter”

i hope i’ve explained myself properly

thanks