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- logic bomb
Small programs included within a larger system and designed to activate when a particular set of circumstances occur. For example, a programmer may include a logic bomb in the system they are developing to cause damage if their name is deleted from the company payroll. They are used for revenge attacks and for blackmail. 
- logic gate
The components used in making logic circuits. Each gate has one or more inputs and produces a single output which depends upon the input(s). Examples are NOT, OR, AND. - logical error
A mistake in the design of a program, for example, a branch to a wrong statement, or the use of an inappropriate mathematical formula. A logical error will be recognised because the program produces wrong results or an incorrect display. It is unlikely to generate an error message because the error is in the program design. - logical operator
Boolean (or logical) operators combine Boolean values using operators such as AND, OR, NOT to produce a Boolean result, TRUE or FALSE. This result can control the flow of a program using IF, WHILE or REPEAT UNTIL statements. - login
The user name and password required to gain access to a computer system. - login
The procedure needed for a user to gain access to a computer system. It might provide access to a computer network, a multi-access computer system, a specially set-up standalone workstation or just a specific application program. Logging on is a part of the security procedures to prevent unauthorised access. Also known as log in, logging on, logging in. - login account
A login account is when a user is registered on a system to gain access to the resources of that system, such as a local area network, or the internet. For example, a login account with an internet service provider is a user name and password required to gain access to the internet. - Logo
Logo was developed as an educational language for use with young children and encourages children to think in a structured way. It contains graphical operations that are easy to use. The subset of Logo commands dealing with graphics is called turtle graphics because it is used to control the movements of a turtle. The turtle can be a small robot with wheels and a pen moving across the floor and drawing or simply a point moving and drawing on the screen. - logout
The procedure to be followed when ending a session on a computer system. Also known as logging off, logging out, log out. - long integer
A variable which can hold an integer whose range is greater than that of a standard integer. - longdesc
An HTML tag similar to the ALT tag, but providing a longer description of an image. - look-up table
A table used to convert one set of values to another set. The table normally has two columns. The first column holds a list of data items and the second column holds a list of related values. For example, the first column might hold product codes and the second column their prices. - loop
A group of instructions which is repeatedly executed. For example, to produce payslips for several workers, the instructions for one payslip are repeated many times with different data. - low resolution
Resolution is the term for the clarity of text and graphics as they appear on a monitor screen or printed on paper. Low resolution images have coarse dots, and a - low-level language
The first computer languages were developed to simplify the process of programming the electronic patterns instead of entering them as 1s and 0s - lower case
Small letters, e.g. a, b, c. The opposite of capital letters, e.g. A, B, C, which are upper case. - lurker
An individual who reads contributions to an online debate or discussion but does not contribute any postings.
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