How do I switch between applications using ALT+TAB combination / How do I assign a keysym to a key?

ALT+TAB combination is handled by Windows OS. To switch between applications, you need to use a different key combination.

To assign the Tab keysym to F10, please follow the instructions below:

1. Start Xconfig.
2. Double-click on Default Profile. 
   RESULT: Profile Properties dialog box opens up.
3. Click on the Devices tab.
4. Click Keyboard Settings. 
   RESULT: Keyboard Settings dialog box opens up.
5. From Keyboard List, select a keyboard file that has a check mark. 
   NOTE: This is your default keyboard file.
6. Click edit. 
   RESULT: Keyboard Editor opens up.
7. Double-click on the F10 key. 
   RESULT: Edit Key dialog box opens up.
8. From the keysym list, find Tab, and click on the left arrow button next to the Normal keysym.
9. Click OK.
10. Save the changes and exit from Xconfig.