Understanding the code by example?

[Mettius]

OK, after spending most of the weekend trying to get something going for a game system not already in HL, I'm exhaused from the learning curve.
I have a very light programming background (bash scripts a plenty, and a book on Java and Python under my belt, but no seasoned programmer to be sure).

Anyway, I've been reading the wiki until my brain feels like... I don't know. But now I've had a beer and a half, and though I'm feeling better, I'm still struggling to understand some of the skeleton code (the beer will help, right?):

So I'm going to attempt to enhance my learning by deciphering the following code bit by bit. For the love of the gods, if anyone can help that would be appreciated.

  <procedure id="DshRolls" scripttype="mouseinfo"><![CDATA[
    var final as string
    var roll as string
    foreach pick in hero where "DashTacCon.Rolls"
      if (eachpick.tagis[component.Skill] <> 0) then
        roll = eachpick.field[sklRoll].text & "{text clrsecond}  (" & eachpick.field[trtFinal].text & " + " & eachpick.linkage[attribute].field[name].text & " " & eachpick.linkage[attribute].field[trtFinal].text & "){text clrreset}"
      else
        roll = "????"
        endif
      final &= eachpick.field[name].text & " {b}" & roll & "{/b}{br}"
      nexteach
    @text = "{align left}" & final
    ]]></procedure>