For the multiple thing one, say if you want to make a brick named
Brick1 turn red and play a sound on the press of a button, here is how it goes (put these events on the switch)
0 [ticked] onActivate>NAMED BRICK(Brick1)>playSound>[your sound here]
1 [ticked] onActivate>NAMED BRICK(Brick1)>setColor>[your color here]
These events below will make a selected brick turn invisible when touched and then turn visible again when touched (put these events on the brick itself)
0 [ticked] onActivate>self>setRendering>[unticked]
1 [unticked] onActivate>self>setRendering>[ticked]
2 [ticked] onActivate>self>toggleEventEnabled>0 1 (put the numbers of the event you want changed from ticked to unticked and vice versa here.)
Here is the link to a tutorial I made that will help you understand certain events and what they do:
http://forum.blockland.us/index.php?topic=48159.0Hope this helps.