Growing flasks is a long complicated process, best not done in the home unless you seriously want to try. To make a long story short, you mix a solution (the agar and other nutrients). You have this sterile, agar soup that's basically food for the seedlings. No, this practice is a substitution for the fungus naturally found in the wilderness. The seeds acquire food from the agar now, not from fungus. The agar is jelly like and is poured into a bottle. Sterilize the seeds (I've heard about putting them in bleach) so the seeds don't carry germs into the agar. With the seeds inside, close up the bottle. If any fungus remains in there and wreak havoc, the seedlings die.
After they grow up, you unflask by removing the contents. The jelly sometimes become dark. Put the whole glob of jelly with its seedlings in some water, swish around, and the roots become loose from the jelly. Then plant them in community pots filled with sphag.
I just thought the process is quite interesting. I'm not going into the details-which are vital--search the web and do some more reading if you're interested.
