Does running several apps at once run the battery down any faster? Also is there a shortcut to see what is running? And a cut for shutting ALL running apps down at once?

Thanks the sprint manual is small and does not cover these things.
Opera/9.60 (J2ME/MIDP; Opera Mini/4.2.13918/724; U; en) Presto/2.2.0

See More: Running apps and battery life