Siemens SIMATIC Box PC 620 Manual page 213

O
Operating System
Collective term for all functions which, in conjunction with the hardware, control
and monitor execution of the user programs, the distribution of resources among
the individual user programs, and the maintenance of the operating mode (for
example, Windows 98, MS-DOS).
P
Parallel Interface
Information is transmitted byte for byte via a parallel interface (port). This means
that the transmission rate is very fast. The programming devices have one parallel
interface (LPT1).
Password
Unique sequence of characters that is entered for user identification. See Access
Protection.
PC
Personal computer
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