howdy, Loga !
yes, you CAN *safely* read my notes, I have tested them *myself* while read twice. They guarantee you deeeeeeep sleeeep

if you read in the night...
Note, if you try to read HF EJB, you will get opposite effect - you will be
laughing boisterously

while read THIS book.
and, yeah, nobody (except Kathy, of course) can compete in EJB knowledge with specification authors. So, I just took excerpts from spec and put them on web-site.
cheers !