Are there any guidelines concerning the use of Alt, Ctrl and Shift keys?

1. What is the use of Ctrl Shift alt?
2. What type of keys are Shift Ctrl and alt?
3. What happens if you press Ctrl Shift alt T?

What is the use of Ctrl Shift alt?

Ctrl+Alt+Shift

Copy a reference (a relative path) of a symbol to the Clipboard. with the specified name. Open the Highlighting levelpopup. Paste the last entry from the Clipboard as plain text.

What type of keys are Shift Ctrl and alt?

Ctrl,shift and alt are called Modifier keys.

What happens if you press Ctrl Shift alt T?

It re-opens the last closed tab. We've all been there: Accidently closing a browser tab that you meant to keep open. Hit Ctrl-Shift-T and your tab will come back.