Question 1

Can this keyboard be used simultaneously with a laptop's built in American one to switch between languages, without changing system settings?

Accepted Answer

Yes. 
Please note that the keyboard is just an inputting device. 
The languages are controlled and enabled by software Apps and/or Windows OS.

When you follow the prompts in enabling a foreign language in setting, select the 
toggle switch between language which Windows would appear near you laptop's clock, 
from which you may toggle between languages... just like that :-)

We were able to Google Enabling Foreign Language Input on Windows® 10:

You can edit documents in multiple languages by changing the language (the input language) in which you type. Input languages are included with Windows, but you need to add them to your list of languages before you can use them.

1.	Open Regional and Language Options by clicking the Start button  , clicking Control Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options. 
2.	Click the Keyboards and Languages tab, and then click Change keyboards.
3.	Under Installed services, click Add.
4.	Double-click the language you want to add, double-click the text services you want to add, select the text services options you want to add, and then click OK.

Question 2

How do you make the q key make the at key?

Accepted Answer

That function is for the software, the keyboard is just an inputting device, whatever application software or language software you are using determines which key to print for what letter.

Try using the Shift and other key combinations, which you may find by Googling it.

Question 3

Does this keyboard work with Linux?

Accepted Answer

Not sure... this keyboard is intended and supports Windows.

We heard that it even work partially with Mac (no F Keys), while with Linux,
no one reported any troubles failure or successes, you might as well try it yourself.

Good Luck.

Question 4

What is bilingual about this? It looks like a normal German keyboard.

Accepted Answer

It allows me to type in my native English and also in German when I need to.

ASIN	B07KTC7X66
Additional Features	Bilingual, Ergonomic, Lightweight
Antenna Location	Everyday Use
Best Sellers Rank	#4,411 in Computer Keyboards
Brand	SolidTek
Button Quantity	104
Color	Black Keyboard White Characters
Compatible Devices	Windows 98, ME, 2000, XP, Vista or above
Compatible Operating System Family	Windows
Connectivity Technology	USB, USB-A
Customer Reviews	3.9 3.9 out of 5 stars (65)
Enclosure Material	Plastic
Hand Orientation	Ambidextrous
Item Weight	1.4 Pounds
Keyboard Description	German Keyboard USB Wired Computer Keyboard
Keyboard Layout	QWERTY
Manufacturer	Solidtek
Mfr Part Number	ACK-2817U
Minimum Required Operating System Version	Windows 6.0
Model Name	Solidtek
Model Number	ACK-2817U
Number of Keys	104
Power Source	Corded Electric
Style Name	Language Keyboard
Theme	Keyboard" or "Bilingual Keyboard
UPC	036663142672
Unit Count	1.0 Count

SolidTek Bilingual German English Black USB Wired Computer Keyboard

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