I face difficulty (when at home) to remember the posts which I have read at office and vice versa.
I found a trick long time ago:
When leaving location 'A' note the time. When logging on at location 'B' find a thread that has a time just before the time you left loc 'A' open it, go back to the thread list and click 'refresh'. This, unfortunately, does not work inside the threads, but, at least, you only get the threads with something new.

Erik