[TxMt] txmt:// URL scheme - Old Release notes?

[Gerd Knops]

Hi,

I can't seem to locate any info about the txmt:// URL scheme anymore.  
It used to be in the release notes, but sadly they now appear to be  
curtailed (not good, I used it as manual all the time!). It's  
probably in the blog somewhere, but without a search function that is  
a bit hard to find. As usual 'Help' is useless. And since the mailing  
list messages are prefixed with [TxMt] a google search isn't helpful  
either...

So where can I find it these days?

Gerd