What is VDT (video display terminal, visual display terminal)?
Posted by Julia Werner •
How do I make my pc speaker beep
"Beep can only work if your PC has a traditional old style "speaker", and probably most if not all laptops and small devices don't have one.
However what they often have instead is a sound chip and one or more speaker(s) that can be used to make any sound you want.
So the outdated advise to install the beep command and/or the kernel module pcspkr will silently never work when you don't have the old style speaker hardware.
INSTEAD: Try playing a sound like this when you want a beep:
paplay /usr/share/sounds/sound-icons/capital
Note this uses the paplay (Pulse Audio Play) command which mixes better with other user level (user app) sounds on your system, and not the older aplay (ALSA Play) command which generally can only play one sound at the same time. But note however, that PulseAudio calls ALSA to actually play the sound.
My previous suggestion to use play might still work, but running SoX of which play is from, is overkill.
Works for me when all else failed. Thanks to: tredegar & hk_centos and others.
How do I determine the serial number of a computer?
Q: How do I determine the serial number of a computer?
Answer
Windows
Open a command prompt (by choosing the Command Prompt item from the Start menu, or typing cmd in the Start menu's "Run" box), and type the following:
wmic bios get serialnumber
Note: Windows 10 users may navigate to the Command Prompt by right clicking on Start button, or by typing "cmd" on Start screen to search it.
Related Supported Vendor links "How to find Serial Number or Service Tag" :
Dell how to find Service Tag
Lenovo how to find Serial Number
Mac OS X
Go to Utilities. Open the Terminal application and type:
ioreg -l | grep IOPlatformSerialNumber
Vendor Link : How to find Apple Serial Number
Linux
Open a shell and type:
sudo dmidecode -t system | grep Serial
Note: The user will need to have root access to the system.
What is VDT (video display terminal, visual display terminal)?
VDT (video display terminal, or sometimes visual display terminal) is a term used, especially in ergonomic studies, for the computer display . A display is a computer output surface and projecting mechanism that shows text and often graphic images to the computer user, using a cathode ray tube ( CRT ), liquid crystal display ( LCD ), light-emitting diode, gas plasma, or other image projection technology. The display is usually considered to include the screen or projection surface and the device that produces the information on the screen. In some computers, the display is packaged in a separate unit called a monitor .
Major issues related to the VDT include the readability of content relative to other media such as paper; the effect of prolonged visual interaction with display content in terms of eye and other muscular fatigue and deterioration; proper viewing distances; and the amount and effect of exposure on users to the extremely low-frequency ( ELF ) radiation that emanates from VDTs.
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