Posted on in Networking
There are a few network devices out there that allow you to connect, but don't give you an option to disconnect. For example, you might be stuck at a password prompt, but have no authentication details. Most telnet clients allow you to break these connections with the ^] (control-]) command. <acronym …
Posted on in Information Systems
Good news today for service providers planning to file an electronic application for either the Broadband Initiatives Program (BIP) or Broadband Technology Opportunities Program (BTOP). The deadline for electronic applications has been extended from 5 p.m. ET on August 14, 2009 to 5 p.m. Eastern Time (ET) on …
Posted on in uncategorized
The following resources were used in the writing of the Introduction to Database Systems article series:
Posted on in uncategorized
The following resources were used in the writing of the Introduction to Programming Concepts article series:
Posted on in Programming
In the early stages of an organization, it is common for most data to be stored in spreadsheets. Spreadsheet applications are common and easily understood by most small business people. Unfortunately, spreadsheets become burdensome when tasks move beyond calculations and into querying (Churcher, 2007). Fortunately, databases are designed with querying …
Posted on in Programming
Having built an entire application, the time has come to consider the possibility of redistributing the application for a wider audience. Since the original application was designed to meet the needs of a specific business, one of the primary considerations will be how the application must be modified to meet …
Posted on in Programming
The widespread use of computers has made database interaction a daily occurrence. Although databases can be large and complex, they are generally defined by basic terms that come together to create the larger system. Understanding these database basics helps users understand the underlying structure of the system and how they …
Posted on in Programming
Modern programs are not developed as singular, autonomous applications. Programmers have learned that many different programs use the same routines over and over again. By developing these routines as independent modules or libraries, programmers gain the advantage of quickly adding functionality to their programs. Modularization allows the detail of often-repeated …
Posted on in Programming
In his excellent series on WordPress Theme SEO, Nathan Rice describes a method to include META tags in WordPress themes rather than relying on plugins. Since I recently updated the Slaptijack theme to include META descriptions and keywords, I thought I would detail the process. If you are interested in …
Posted on in Software
Firefox 3.5.2 was released by the Mozilla Project today. This release is mainly a security fix and all users are advised to download the new update as soon as possible. Please take the time to download this important security update today.
A list of security fixes is available …
Posted on in networking
You may already know that the IEEE 802.1D specification recommends a maximum network diameter of 7 hops. What you may not know is that the number 7 is derived from a series of calculations based on various timers being tuned to their default values. If you are designing a …
Posted on in Software
ISC is urging BIND users to upgrade their production DNS servers immediately. ISC recently announced a patch to fix an exploit in BIND. This exploit is in the wild and has been used to crash BIND servers resulting in a denial of service. Using a specially crafted dynamic update packet …
Posted on in Programming
Decision structures (also known as selection structures) are used in programming to take an action based on the result of a question (Farrell, 2008). An if-then-else statement is the most basic kind of decision structure. The question is represented as a Boolean expression that results in a true or false …
Posted on in Programming
Referential integrity and business rules are two subjects that individuals new to database design find confusing. Relational databases use tables to represent things and events. It is often necessary for a table to refer to another table. In this case, the two tables have a relationship. Referential integrity ensures that …
Posted on in Software
I use VirtualBox to run a Microsoft Windows guest
on my iMac. For some reason, VirtualBox did not notify me that version 3.0 had
been released. This new version includes symmetric multi-processing (SMP) for
guest systems, Direct3D 8 and 9 for Windows guests, and OpenGL support for Windows,
Linux …
