Hi, i was thinking about playing the game one more time and there is still a few things i know i have not completed

so i need help on the following:

How to enter the room guarded by a dog and a solider in Junon?

How to get Alexander materia in the glacier?

How do i unlock the chest in Kalm?

What dig options and where to find the key to get back into midgar?

And is it really impossible to get into the room guarded by soliders after jumping of the train? (i have fought there for hours until i got Clouds next last limit break ^^)

Thanks for your help! The first question is the most important

btw this is really lame: http://auritribe.net/cnn/