when you top you make a clean cut removing all of the top of the plant between two nodes. this will cause the top two nodes to grow into two new tops.
when you fem you cut off the top HALF of the cluster of new growth at the top of the plant. if you can cut it at the VERY tip down inside the cluster you will cause the top of the plant to split off into numerous directions.
i'm a liitle fuzzy. that's the best way i can word it right now. hope this helps.
That was an awesome way to explain it...... I did it to Trainwreck and got 3 tops. I was like hummmm....I don't remember how I did that.......Thanks FDD, good post & to the point to rambling bullshit.....GJ...