so i was in the bank a few days ago and i was looking at some of the computers they were using as i walked by some offices. i immediately realised that they were using windows computers (Dell specifically) and had to wonder how is their security special? i realised there must be some measures they take to make sure their databases and all online banking is safe. does anyone here know what they use.

i dont have a bank account that supports online banking, so i cant really check what they use. im sure it also varies on bank accounts, but there's probably similarities.
anyone know what they use inside their networks?
also, its not really cryptology related but what firewall's do they use?
i dont want to ask to many questions because it probably starts looking a little strange but id like to know what ever anyone feels is ok to post

i ask because of curiosity and also because of the fact that if banks need higher security whats to keep me from implementing the same security (other than money, time, and bandwidth limitations that dont outway value of improved security )