need help setting up toshiba bdx1100

[ben996]

hi, i own a toshiba bdx1100, i just need some help picking settings, thank you if anyone can help,
1.Under general setting, system it says CEC, on or off, what does that mean.
2.It also says upgrade and disc auto upgrade, i presume that means updates for the player, can someone confirm this for me.
3. It also says external memory, what does that mean.
4. What does load default mean, i know i should know this so sorry.
5. Screen saver means when you don't touch it for a while something happens, can someone confirm this.
6. DIsc auto playback, whats that.

thanks, sorry for trouble