Login Authentication & Dictionary Questions

Hello everyone!!

I have a couple questions
btw, I'm running Leopard 10.5.6

first question:
when I press "Command+Control+D" when i hover over a word to look up its meaning in Dictionary it doesn't do anything... and when I Control-Click it and select "Look up in Dictionary" it doesnt do anything either... and I tried doing both things when I had Dictionary running in the background and when it was closed and nothing.... so, what can I do?

second question:
since i got my macbook i used to always close the lid to put it to sleep between classes and every time I open it, it asks me for authentication and password...
now, it's not doing that! and if I close it, and perhaps, go to the bathroom or something, anybody can open and it logs in w/o password....
maybe I changed something in Settings w/o realizing but can't remember...

[EDIT]
I just remembered! in iTunes, I want to disable the little link button to iTunes Store next to each song/artist/etc... I know if I disable iTunes Store from Parental Controls, it'll do it.... but if I do, I won't be able to download Apps! How can I turn them off??

Thanks in advance!!

 

1. I'm trying it with almost every app... mainly Apple ones... Safari, Pages, Mail...

2. ok.. it worked.. thanks !

3. thanks, anyway...