Keyboard Checker
KeyboardTest
Test-a-key.com
Aqua's KeyTest
Keyboard Tester Pro
Test-keyboard.Online
TestHub360
Free Virtual Keyboard
HTTP Debugger
Surge for Mac
Charles Proxy
Weer
James
HTTP Headers
HTTP Toolkit
mitmproxy
HTTP Debugger is a professional HTTP sniffer and analyzer for developers.
You can use HTTP Debugger to debug HTTP API calls to a back-end and between back-ends.
HTTP Debugger is very easy of use, with clean UI, and short ramp-up time.
It's not a proxy, and does not produce network issues!
Keyboard Checker
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We don't know anything besides the laptop being from early 2010s so all we can guess is that it might be Plus, or a mute audio key, or it could just be a "Pause/break" function key, maybe an eject key. Google for a website that does a key function test so when you press that key you can see what it actually is, here is one I found: https://keyboardchecker.com/. Source: over 2 years ago
But now when I press the Office Key it's like I'm just pressing End, and then I press the Emoji Key it's like I'm just pressing Space. It worked on https://keyboardchecker.com, but not in-game. I've played around with *, {Blind}, ^!+, etc., but nothing I do gets it to continue allowing me to apply modifiers to End without making the Emoji Key go back to overlapping. Source: about 3 years ago
Try using https://keyboardchecker.com/ and see what lights up when you press M. If multiple things are lighting up, you may have an electrical issue with your keyboard. Source: about 3 years ago
That doenst sound like a keyboard issue.What OS? What happens if you use delete key in text editor? Behaves as expected? You can check what key codes the keyboard generates when you press delete: maybe try this site https://keyboardchecker.com/ You could also boot off a live-CD for Ubuntu or something and just test the keyboard in Ubuntu - see how it behaves... Will help you figure out if it's hardware or... Source: about 3 years ago
I investigated the behavior with Keyboard Checker and found that, when I pressed the left Ctrl, and then the Z key, pressing the Z key released the left Ctrl key, which explained the z string. Also, this behavior is unique to that exact physical key. For example, on an American layout, my keyboard would start inputting ys because that's the character mapped to this physical key on that layout (tested). Source: over 3 years ago
KeyboardTest - PassMark KeyboardTest allows users to quickly check that all the keys on their computer keyboard...
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Test-a-key.com - Free online keyboard tester to check key functionality instantly. Test QWERTY, special keys, and toggle Glance Mode for persistent highlights.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Aqua's KeyTest - The program lets you check to see if all keys on your board function properly
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface