irt.org FAQ Knowledge Base Q226
Ralph Lombreglia on September 10, 2000 at 09:06:45:
The "999999999" in the refresh META tag will cause a page to refresh indefinitely in Win IE 5.x under Win 2K or NT.
For some reason, 500363690 is the magic number... any setting of 500363690 or higher causes IE to refresh indefinitely. 500363689 will not. Weird but true.