Single halflinks on normal chains

I don't really know I just saw it on a postcard in the shop.

BTW I have this chain tool http://www.parktool.com/products/detail.asp?cat=5&item=CT-5 is that heavy duty enough? I was told by the shop that it does both 1/8 & 3/32
No, that's the one I've got (you'd have thought at £15 it'd do the job).

This is the one you'll need:

Check out the tool swap thread, I'm sure someone on here has it.