what is the 'secure:true' search modifier

[netcommr]

stumpd

can't find any info on this modifier 'secure:true'

not listed here [webmasterworld.com]

any direct search using it returns nill

Your search - blue widget - did not match any documents.
No pages were found containing "secure:true blue".

[GoogleGuy]

Haven't heard of that one, netcommr.

[netcommr]

here is an example [googlesite.google.com]

I get a js error w/ie6 on win/xp