Boolean Operators Words that are utilized in the catalog system to connect separate words into complete searchable strings. For example, AND, OR, and NOT are boolean operators. Searching A feature of a catalog which allows the user to search by screen, not neccessarily using a specific word. A character set may include letters, digits, punctuation, control codes, graphics, mathematical symbols, and other signs. Each character in the set is represented by a unique character code, which is a binary number used for storage and transmission.
Different sets have different mappings between codes and characters.
For example, a workstation requesting the contents of a file from a file server is a client of the file server. A client sends requests to a server, according to some protocol, asking for information or action, and the server responds. There may be either one centralized server or several distributed ones. Command Line Interfaces A means of communication between a program and its user, based solely on textual input and output. Commands are input with the help of a keyboard or similar device and are interpreted and executed by the program.