1. In Microsoft Word, Excel, and PowerPoint, the shortcut key to open a new document or window is Ctrl+N. Pressing this key will open a new document or window.

2. If you want to open a specific type of document, you can select a specific document type following the Ctrl+N key combination. For example, if you want to open a new Word document, you can select Word Document followed by the Ctrl+N key combination.

3. Here are some other shortcut keys that can be used to open a new document or window-

- Ctrl+O: Open an existing document

- Ctrl+S: Save the current document

- Ctrl+P: Print the current document

- Ctrl+X: Cut selected content

- Ctrl+C: Copy selected content

- Ctrl+V: Paste selected content

- Ctrl+Z: Cancel previous action

- Ctrl+Y: Redo the previous action

1. Supercomputer is a powerful computer in terms of data storage capacity, performance and data processing.

2. A supercomputer is a powerful computer that can process large amounts of data and computations very quickly.

3. Supercomputers perform copious amounts of mathematical calculations.

4. Supercomputers are used for a wide variety of applications, including meteorology, medical research, and nuclear weapons research.