Crystal type malts are grain that needs to be steeped in hot water at about 70 deg (not boiling) then you use the licquor that results from the steep, discard the actual grain and boil the liquid. They don't need to be mashed like base malts and such. Medium Crystal malt adds a slight caramel/toffee taste. Prolly one of the must have malts IMO. Craftbrewer has a fair bit of info on each grain they stock http://www.craftbrewer.com.au/shop/details.asp?PID=779
Man I'm sooooo slow at typing
Thats alright
At least you pointed out that its an important step to actually boil the liquor achieved from the steeping/straining process to kill any potential bacteria before you add this into the fermenter.