Firewalls....are all provided by commercial companies...who give their backdoor option over to NSA, in exchange for something (maybe tax credits, maybe information on competition, etc). The fed’s can walk into anyone’s computer....browse, and note anything. This is why having your phone, ISP, and financial data are all important. Unless you disconnect your computer from the provider, that’s about the only way to achieve real security.
Possibly true, but she may have been hacked / cracked when connected to a public site that allows device discovery. Probably not - probably was an "inside job" from a SysAdmin who opened her computer to an outside agent - directed by CBS cronies of ObaMao.
If an employee is on the corporate LAN, then their computer's IP address should not be routable - therefore, external devices cannot discover or gain access to the computer1. Certain OS features or specialized software can be used to connect from the Internet through a firewall to a PC (on the private corporate network), but it's turned off by any corporate admin worth their salt.
1 A firewall takes the corporate public IP address used to connect to the Internet and obfuscates it on the private side by issuing a non-routable IP address to all connected devices in order to route traffic between the private and public (Internet) domains. It's called NAT - Network Address Translation - gives devices on the corporate side an IP address in the 192.xxx.xxx.xxx range.