Please Tell Me Some Shortcut Keys Of DOS, WINDOWS, M.S. WORD And EXCEL?

ctrl+c for copy,
ctrl+v for paste,
ctrl+b for bold,
ctrl+u for underline,
shift+'+' for increment,
shift+'-' for decrement.

Keys for Windows:

CTRL+C  Copy.
CTRL+X  Cut.
CTRL+V  Paste.
CTRL+Z  Undo.
DELETE  Delete.
SHIFT+DELETE  Delete selected item permanently without placing the item in the Recycle Bin.
CTRL  while dragging an item Copy selected item.
CTRL+SHIFT  while dragging an item Create shortcut to selected item.
F2  Rename selected item.
CTRL+RIGHT  ARROW Move the insertion point to the beginning of the next word.
CTRL+LEFT  ARROW Move the insertion point to the beginning of the previous word.
CTRL+DOWN ARROW  Move the insertion point to the beginning of the next paragraph.
CTRL+UP ARROW  Move the insertion point to the beginning of the previous paragraph.
CTRL+SHIFT  with any of the arrow keys Highlight a block of text.
SHIFT with any of the arrow keys Select more than one item in a window or on the desktop, or select text within a document.
CTRL+A  Select all.
F3  Search for a file or folder.
ALT+ENTER  View properties for the selected item.
ALT+F4  Close the active item, or quit the active program.
ALT+Enter  Displays the properties of the selected object.
ALT+SPACEBAR  Opens the shortcut menu for the active window.
CTRL+F4  Close the active document in programs that allow you to have multiple documents open simultaneously.
ALT+TAB  Switch between open items.
ALT+ESC  Cycle through items in the order they were opened.
F6  Cycle through screen elements in a window or on the desktop.
F4  Display the Address bar list in My Computer or Windows Explorer.
SHIFT+F10  Display the shortcut menu for the selected item.
ALT+SPACEBAR  Display the System menu for the active window.
CTRL+ESC  Display the Start menu.
ALT+Underlined letter in a menu name Display the corresponding menu.
Underlined letter in a command name on an open menu Carry out the corresponding command.
F10 Activate the menu bar in the active program.
RIGHT ARROW Open the next menu to the right, or open a submenu.
LEFT ARROW Open the next menu to the left, or close a submenu.
F5  Refresh the active window.
BACKSPACE View the folder one level up in My Computer or Windows Explorer.
ESC Cancel the current task.
SHIFT when you insert a CD into the CD-ROM drive Prevent the CD from automatically playing.

Keys for Excel:

Ctrl+A Select All
Ctrl+B Bold
Ctrl+C Copy
Ctrl+D Fill Down
Ctrl+F Find
Ctrl+G Goto
Ctrl+H Replace
Ctrl+I Italic
Ctrl+K Insert Hyperlink
Ctrl+N New Workbook
Ctrl+O Open
Ctrl+P Print
Ctrl+R Fill Right
Ctrl+S Save
Ctrl+U Underline
Ctrl+V Paste
Ctrl W Close
Ctrl+X Cut
Ctrl+Y Repeat
Ctrl+Z Undo
F1 Help
F2 Edit
F3 Paste Name
F4 Repeat last action
F5 Goto
F6 Next Pane
F7 Spell check
F8 Extend mode
F9 Recalculate all workbooks
F10 Activate Menubar
F11 New Chart
F12 Save As
Ctrl+: Insert Current Time
Ctrl+; Insert Current Date
Ctrl+" Copy Value from Cell Above
Ctrl+' Copy Fromula from Cell Above

Shift Hold down shift for additional functions in Excel's menu

Shift+F1 What's This?
Shift+F2 Edit cell comment
Shift+F3 Paste function into formula
Shift+F4 Find Next
Shift+F5 Find
Shift+F6 Previous Pane
Shift+F8 Add to selection
Shift+F9 Calculate active worksheet
Shift+F10  Display shortcut menu
Shift+F11  New worksheet
Shift+F12  Save
Ctrl+F3 Define name
Ctrl+F4 Close
Ctrl+F5 XL, Restore window size
Ctrl+F6 Next workbook window
Shift+Ctrl+F6   Previous workbook window
Ctrl+F7 Move window
Ctrl+F8 Resize window
Ctrl+F9 Minimize workbook
Ctrl+F10 Maximize or restore window
Ctrl+F11 Inset 4.0 Macro sheet
Ctrl+F12 File Open
Alt+F1 Insert Chart
Alt+F2 Save As
Alt+F4 Exit
Alt+F8 Macro dialog box
Alt+F11 Visual Basic Editor
Ctrl+Shift+F3 Create name by using names of row and column labels
Ctrl+Shift+F6 Previous Window
Ctrl+Shift+F12 Print
Alt+Shift+F1 New worksheet
Alt+Shift+F2 Save
Alt+= AutoSum
Ctrl+` Toggle Value/Formula display
Ctrl+Shift+A Insert argument names into formula
Alt+Down arrow Display AutoComplete list
Alt+'                 Format Style dialog box
Ctrl+Shift+~ General format
Ctrl+Shift+! Comma format
Ctrl+Shift+@ Time format
Ctrl+Shift+# Date format
Ctrl+Shift+$ Currency format
Ctrl+Shift+% Percent format
Ctrl+Shift+^ Exponential format
Ctrl+Shift+& Place outline border around selected cells
Ctrl+Shift+_ Remove outline border
Ctrl+Shift+* Select current region
Ctrl++ Insert
Ctrl+- Delete
Ctrl+1 Format cells dialog box
Ctrl+2 Bold
Ctrl+3 Italic
Ctrl+4 Underline
Ctrl+5 Strikethrough
Ctrl+6 Show/Hide objects
Ctrl+7 Show/Hide Standard toolbar
Ctrl+8 Toggle Outline symbols
Ctrl+9 Hide rows
Ctrl+0 Hide columns
Ctrl+Shift+( Unhide rows
Ctrl+Shift+) Unhide columns
Alt or F10 Activate the menu
Ctrl+Tab In toolbar: next toolbar
Shift+Ctrl+Tab In toolbar: previous toolbar
Ctrl+Tab In a workbook: activate next workbook