I tried the forum search box, the Google search box, and searching Google from my browser with the qualifier site: progresstalk.com. In each case the search text was "_tablestat-read".
The site search gives me two hits from the same thread, dated Nov 5 1999.
Google gives me five hits, including one from the 1999 thread.
The custom Google site search seems to give the same five hits.
Then I tried the PT custom Google search with the search term blockdelete. It came up with 4,080 hits. Most of the hits on the first page were from google.com/patents. None were from the domain progresstalk.com.
I tried a google search on this site for "checkpoint duration". I got 4 hits. The custom site search gave me 7 hits; those four plus hits from google.com/maps and google.com/patents. The site search box (the old one) gave me no hits.
So I think further tweaking and testing is required before either of these search methods is declared to be working.
The search box at the top of the page (not the Google one) only seems to give results that are very old or very new. It gives only five results for that search term, two of which are in this thread. The others are from 2003 and earlier.