Answer:The function of Ctrl + Page Up is to navigate to the previous tab or document in certain applications or web browsers. This keyboard shortcut is commonly used in programs that have multiple tabs or documents open simultaneously. Here's how it works:
1. Open an application or web browser that supports multiple tabs or documents.
2. Press and hold the Ctrl key on your keyboard.
3. While holding Ctrl, press the Page Up key.
4. The active tab or document will switch to the previous one in the sequence.
For example, if you have three tabs open in your web browser, pressing Ctrl + Page Up will navigate you from the current tab to the previous tab.
Please note that the exact function of this shortcut can vary depending on the specific program or web browser you are using. It's always a good idea to check the documentation or help resources of the application you are using to understand the specific functionality of keyboard shortcuts.
Step-by-step explanation: