How to obtain position/view within PDF

Question

There is much information regarding how to open a PDF at a particular page etc. from the command line.
How can the data be obtained and stored externally while reading the document.
Perhaps more precisely, if I edited a page and then later wanted to open the PDF at a specific edit from, say, a shortcut, because I don't wish to write down the page number how might I go about obtaining the data to add to the shortcut command line?
Thank you

Answer 1

Thank you.
I have read from the link you provided but it only tells me what I knew regarding how to achieve this manually not programmatically.
I can see that I have not explained very well.
I wish through external means (a program/script I will write), to click a button at any time and multiple times, while reading a PDFand have the program obtain (from somewhere/anywhere/even Windows itself) the position I am at while reading a PDF and inject it into a url.
The end result will be a list (in an HTML page?) of the url's I have saved. i.e. the same as internal bookmarks but external.
The information exists because a PDF can be re-opened at the current page when closing by it saving that information.
I do understand that I can do it by noting the position myself and injecting it.
Useage example:
While editing video's I am reading from several PDF's at the same time, with differing viewpoints, and at various stages I want to bookmark and make a comment from whichever PDF my eyes are on (thus effectively at random).
Doing it within the PDF does not tell me (later, externally) which PDF or the order in which the bookmarks were made, if I wish to recreate the learning process.
All I can at present do is open each PDF and got to its various bookmarks out of sequence both within the book and choice of book.
Clearly the bookmarks need to appear in a list in the order created and each must select the appropriate book and page within that book. Then the previous session's progress can be recreated.
Perhaps it is now clearer.
I can write the program but where do I obtain, programmatically when I click the button, the current PDF title (file url) and page number within it, to place in the list of url's?
Any suggestions please