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ID cards can store a variety of information, it can be as simple as an identification number on a bar code or magnetic stripe, or as sophisticated as biometric information encoded on a smart chip. Beyond security concerns, the new generation of smart cards can open doors or sign employees in and out. ID card printers provide ease for making any kind of identification card for banks, government offices, colleges and universities, hospitals and private offices.
also ocr software can come in activeX form with programmable digital encodings + your expenditure of a laser printer it's still a saving of £200-300
personally I would give most users a unique login code. it's probably the cheapest to administer with virtually no overheads, each quarter,month or year you can set the password to expire, you could use a random md5 hash for this or just /dev/random from the system, even php can generte rndom data within an acceptable range.
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