Why are cookies unrecognized when a link is clicked from an external source (i.e. Excel, Word, etc…)

Question

I noticed that when a link is clicked externally from the web browser, such as from Excel or Word, that my session cookie is initially unrecognized, even if the link opens u

Answer 1

1.From excel/word point to http://example.com/from_excel.php

2.In "from_excel.php" redirect to page where you use session