Please post all your little (and not so little) tip, tricks and shortcuts you know about in Windows XP. Even thought XP might be out of support, a lot of people and businesses still use XP, so this can definitely help those 
Some of these even still work in newer versions of Windows too
ALT + TAB - Switches between active programs
ALT + F4 - Closes program or opens 'Shut down computer'
ALT + SPACEBAR - Open Windows Properties menu
CTRL + A - Select all
CTRL + C - Copy selected item(s)
CTRL + P - Print selected item(s)
CTRL + V - Paste copied/cut item(s)
CTRL + X - Cut selected item(s)
CTRL + Y - Redo last action
CTRL + Z - Undo last action
CTRL + Enter - Complete an internet address entry w/ http:www. (your text here).com
CTRL + ESC - Open Start Menu
CTRL + ALT + DEL - Opens Task Manager
CTRL + LEFT CLICK - Select multiple items at once individually
SHIFT + LEFT CLICK - Select multiple items at once within a range
SHIFT + DEL - Deletes item, bypasses Recycle Bin
SHIFT + F10 - Open Context Menu for item
SHIFT + CDROM - Hold Shift & insert CDROM to prevent Autoplay
SHIFT + TAB - Steps backward through screen elements
TAB - Steps forward through screen elements
F1 - Open Help function
F2 - Rename/Enter text for item
F3 - Search key
F5 - Update/Refresh active window
F11 - Toggle Full screen mode
Windows XP is optimized for processors having 256KB of Level2 cache. However, many of today's processors have more than this. Find out how much Level2 cache your processor has and carry out the following tweak:
1. Navigate to the registry branch HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\Memory Management.
2. Create a new DWORD under this branch called 'SecondLevelDataCache' and assign it a value corresponding to the amount of your processor's Level2 cache (for example, 512 or 1024 in the case of 512KB or 1MB respectively.)
3. Restart Windows and you will should see a further increase in performance of your system!
Some of these even still work in newer versions of Windows too ALT + TAB - Switches between active programs
ALT + F4 - Closes program or opens 'Shut down computer'
ALT + SPACEBAR - Open Windows Properties menu
CTRL + A - Select all
CTRL + C - Copy selected item(s)
CTRL + P - Print selected item(s)
CTRL + V - Paste copied/cut item(s)
CTRL + X - Cut selected item(s)
CTRL + Y - Redo last action
CTRL + Z - Undo last action
CTRL + Enter - Complete an internet address entry w/ http:www. (your text here).com
CTRL + ESC - Open Start Menu
CTRL + ALT + DEL - Opens Task Manager
CTRL + LEFT CLICK - Select multiple items at once individually
SHIFT + LEFT CLICK - Select multiple items at once within a range
SHIFT + DEL - Deletes item, bypasses Recycle Bin
SHIFT + F10 - Open Context Menu for item
SHIFT + CDROM - Hold Shift & insert CDROM to prevent Autoplay
SHIFT + TAB - Steps backward through screen elements
TAB - Steps forward through screen elements
F1 - Open Help function
F2 - Rename/Enter text for item
F3 - Search key
F5 - Update/Refresh active window
F11 - Toggle Full screen mode
Windows XP is optimized for processors having 256KB of Level2 cache. However, many of today's processors have more than this. Find out how much Level2 cache your processor has and carry out the following tweak:
1. Navigate to the registry branch HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\Memory Management.
2. Create a new DWORD under this branch called 'SecondLevelDataCache' and assign it a value corresponding to the amount of your processor's Level2 cache (for example, 512 or 1024 in the case of 512KB or 1MB respectively.)
3. Restart Windows and you will should see a further increase in performance of your system!
