PASV ("passive mode") is necessary when running a FTP client behind a firewall, as the default ("active mode") method will fail since the FTP server is unable to open a client to the client, usually because of NAT or firewall limitations.
The computer is running on the Windows operating system.
Obviously many different PDAs have different names for their operating systems. But generally you would call it an embedded operating system, as it is running on an embedded device.
You need to check the firewall service, it must be running.
Means you are running an organization/company "in the black," or in other words, you are generally keeping more money than you are spending.
The "Programs" section these are the programs and or processes (depending on your operating system; In XP and 2K they have separate tabs) currently running on your computer. A lot of these run in the background and are required by your operating system and other software such as your firewall and anti-virus software.
It is not necessary in many cases, but in places like operating rooms and emergency rooms, power is absolutely required for lighting and running equipment. People would die if power went off.
On the firewall
The Mac, running any version of OS X, has a built-in firewall that is sufficient. In Leopard, the firewall is located in the Security pane of System Preferences.
You should always have a firewall program running. Anti-virus programs can only do so much !
Computer operating speed is generally the speed at which the CPU operates, known as the clock speed. It is expressed in Mega-Hertz or Giga-Hertz. For example a Pentium M processor running at 1.8 Gigahertz is being clocked internally at 1.8 GHz.
Operating System
Windows XP has a built in Firewall. Turn it on. One free one is Zone Alarm if you are not running XP.