As far as I know, and that's pretty limited, Game150 is a folder in MS0:/PSP/ if it isn't there, then simply create one.
I believe Game150 is also a .txt file in ms0:/seplugins, but if you're not using plugins that shouldn't be a concern.
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If you mean a game save [under Game > Saved Data Uility on your XMB] then the games that you play will automatically load those for you. If you mean a saved homebrew game, read the readme.txt they usually come with, it will tell you to move all the data to "psp/game" or maybe "psp/game150" ect..
The thing that powers the PSP. It also enables you put put Custom FirmWare on the PSP
You put games in the ISO folder.
you can put portals of psp on it
No,download only.