For development issues encountered while using Red Hat Enterprise Linux 5

Links a name with actual data (file). Hard-linking allows the file to have multiple names (handles). Present in POSIX-compliant systems (also only partially!): GNU/Linux, Android, Apple Mac OS X and even Windows, though with limitations. Allows for slightly different aliasing than soft-linking (aka symbolic linking) - there are trade-offs to each methods.

An unefficient usage of disk storage in memory or hard drive.

A pushdown automaton (PDA) is a finite-state automaton with added stack based memory. It is a mathematical description of an algorithm for parsing context-free languages.

The isql utility is a command-line Interactive SQL utility that uses the Adaptive Server Enterprise Open Client API.

Software transactional memory (STM) is a mechanism for synchronization in concurrent programming, which can perform groups of memory operations atomically. Using transactional memory (implemented by optimistic synchronization) instead of locks removes the risk of a deadlock.

rufus-scheduler is a job scheduler for Ruby (at, cron, in, every and interval jobs). It's not a substitute for cron, it's just a small in-process scheduler.

Questions about client-side form validation in browsers, as defined in the HTML Living Standard. For questions about checking HTML documents for conformance errors, use the [w3c-validation] tag instead.

HTML input control for uploading files `<input type="file" />`

JTAG is a common interface used for programming and debugging microprocessors and other types of embedded devices.