>

Writes the command output to a file or a device, such as a printer, instead of the Command Prompt window or a handle.

<

Reads the command input from a file, instead of reading input from the keyboard or a handle.

>>

Appends the command output to the end of a file without deleting the information that is already in the file.

>&

Writes the output from one handle to the input of another handle.

<&

Reads the input from one handle and writes it to the output of another handle.

|

Reads the output from one command and writes it to the input of another command. Also known as a pipe.

[http://technet.microsoft.com/en-us/library/cc772622%28WS.10%29.aspx]