This is the explanation of the COPY command. It is INTERNAL.

This command copies one file from one disk or subdirectory
to another one. It is even possible to change the name in 
the process.

Example:
       To just copy Test.bat from Drive A to drive B you 
       type:
           copy a:test.bat b:
       To copy the Test.bat from drive A and name it Result.bat
       on drive B you type:
           copy a:test.bat b:result.bat