Code completion in IDE?

Hi.

Does the current IDE have code completion?

No.

There's some weird thing if you press F5 in the IDE but I'm not sure where the words it's suggesting there are from?

That's an OS X feature, press F5 or Option + Escape in any Cocoa app to bring up the list. The words are from OS X's dictionary.

My favourite unintentional IDE feature - Spell Check!