I have done my best to figure this out from the documentation but although it features in the available menus in the list of actions I can't find anywhere that actual documents the purpose or what it achieves. I am hoping that it allows inline commenting of the code but I have read in other posts that this isn't something that exists in RM...
TIA
OMG - I just got sucked into that last post. 
Hilarious that after Bruce consented and added comments, it continues for 47 more replies!!
I now see where cut/paste came from!! 
Oh no! I hope I haven't opened old wounds with this thread. I did find that topic but didn't read it thoroughly enough to find the post linked by @672southmain.
Got my answer though - thanks community!
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