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P

PDF
Stands for Portable Document Format. A universally readable file format created by Adobe Acrobat.

public method
In object-oriented languages such as Java, public is one of several modifiers used to control access to a method. A public method is available to any class in any file.

referential integrity
A condition by which a table’s foreign key must have either a null entry or a matching entry in the related table. Example: An attribute, SALES_REP, is a foreign key in the CUSTOMER TABLE and the primary key in the SALES REPRESENTATIVE TABLE. Every non-null value of SALES_REP in the CUSTOMER TABLE will have a matching entry in the SALES REPRESENTATIVE TABLE if the tables exhibit referential integrity. See entity integrity.

RMI
The Java Remote Method Invocation (RMI) system allows an object running in one Java Virtual Machine (VM) to invoke methods on an object running in another Java VM. RMI provides for remote communication between programs written in the Java programming language.

rsync

An open source utility that provides fast incremental file transfer. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.