This is the sort of topic where using the forum search is a good idea to help you find what you want instead of waiting for responses to a new post. Here are a few I found - there are 1000 posts in the Poser forum mentioning DPI.

From 1999:

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=36123&ebot_calc_page#message_36123

From 2003:[

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=1060778&ebot_calc_page#message_1060778](http://www.renderosity.com/mod/forumpro/showthread.php?message_id=1060778&ebot_calc_page#message_1060778)

From 2008:

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3179853

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=1907973

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)