Mac OS X: Apple Double Format Creates File Name With the Prefix '._'

Regarding article 106510 I have offered feedback to Apple:

The article does not describe how ._ dot underscore files occur when using Finder to copy from (say) an HFS+ volume to a filing system (or using a protocol) that lacks support.

It seems to me that ._ files may be present at the destination for the duration of the Finder copy routine.

(Amongst the contents of such files: an indication that the counterpart to the ._ file is BUSY, being written by Finder. type = brok creator = MACS .)