yes
No they do not play on a PSP
It's only possible to turn on your PSP with an adapter for the PSP or a battery for the PSP.
It is not possible for your PSP to get hacked. There is no need to worry about your PSP getting hacked by anyone.
Yes
Yes, it is possible for you to have multiple IRA accounts.
You may purchase and download PSP games from the PlayStation Network Store, accessable from the PSP's menu.
The emerald cartridge is for the game boy advance The psp uses cds It is not possible for emerald to work on a psp
Yes, it is possible for you to have multiple TD Ameritrade accounts.
From what I've seen you can't but i know there is a possible way , but I'm sure there is but its hard to find out
yes it will play PSP downloads and does not have UMD slot
No its impossible but if you have some special psp software converter it may be possible.
It is not yet possible to downgrade a PSP 3000 series.