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Glossary
© National Instruments Corporation
G-9
P
PCI
Peripheral Component Interconnect. High-performance expansion bus 
architecture commonly found in PCs.
PID
Proportional-Integral-Derivative. A three-term control mechanism 
combining proportional, integral, and derivative control. You might use a 
PID algorithm to control processes such as heating and cooling systems, 
fluid level monitoring, flow control, and pressure control.
plot
1. Trace (data line) on a graph representing the data in one row or column 
of an array. 
2. To display a new set of data while deleting any previous data on the 
graph.
point
Structure that contains two 16-bit integers that represent horizontal and 
vertical coordinates.
postback
The process in which a Web page sends data back to the same page on the 
server.
property
Attribute that defines the appearance or state of an object. The property can 
be a specific value or another object with its own properties and methods. 
For example, a value property is the color (property) of a plot (object), 
while an object property is a specific Y axis (property) on a graph (object). 
The Y axis itself is another object with properties, such as minimum and 
maximum values.
property editor
A control used to configure properties for Windows Forms controls at run 
time.
property pages
Window or dialog box that displays current configuration information and 
allows users to modify the configuration.
PXI
PCI eXtensions for Instrumentation. Rugged, open platform for modular 
instrumentation with specialized mechanical, electrical, and software 
features. Refer to 
www.pxisa.org
 for more information.