This is the official manual for the latest Org-mode release.
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Buffer-wide header arguments may be specified as properties through the use
of #+PROPERTY: lines placed anywhere in an Org mode file (see
Property syntax).
For example the following would set session to *R*, and
results to silent for every code block in the buffer, ensuring
that all execution took place in the same session, and no results would be
inserted into the buffer.
#+PROPERTY: session *R*
#+PROPERTY: results silent