[Newbies] What do the (x) suffixes in menus mean?

Hi Guys -

I'm new to Squeak (but not Smalltalk) - I've fired up Squeak images over the years and been put off by the sheer noise in the user interface - but then I discovered Damion's dev image and it looked a bit more approachable - so I'm trying to get started.

I've been trying the seaside tutorial to get going, and one thing that I have noticed is that when I right click (I'm using windows) I get a menu and it has items that have suffixes like "do it (d)" "pretty print (r)".

What do the items in brackets mean? I thought they were some sort of keyboard shortcut but I can't seem to work out how I invoke them - in particular I was interested in how to quickly reformat my code when pasting in examples from the tuturial?

Tim