/me notes the date on the post before yours...

Yeah...serious necromancing there

yeah, I know

But still the documentation that Miah suggested isn't really ... hmmm... let's say exhausting?
Not to pick on the fact that there really isn't any literature that tells you how a central mainframe system with a protective gateway is hacked.

Something that says that you need to put the gateway sub zero before the mainframe would even let you connect to it and thus giving you the possibility to do something to it.