error doing search using :grep or findstr

If I run findstr from a cmd prompt, I can see that if you give it no parameters, then it says bad command.. And if you give it a pattern and no file or stdin, then it tries to take from stdin

C:\>"c:\Program Files (x86)\Vim\vim74\vim"

C:\>
C:\>
C:\>findstr
FINDSTR: Bad command line

C:\>findstr there
dsfsdf
dsfds

C:\>


When in VIM,
e.g. I open a cmd prompt and run
C:\Program Files (x86)\Vim\vim74>vim.exe

I write some text dfdsfdsfsdfsdfsdfsds__there_dfsdfdsfdsfdsfsd

and do

:grep there

then it exits back to the cmd prompt and tries to read stdin until I Ctrl-C

http://i.imgur.com/ES5yHea.png


Why can't it read what is in VIM?

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