Can I use accesskey on a form?

I've a doubt regarding the possibility that a user can choose to catch
up a form using a "accesskey" so as on the link. I know TabIndex but I
do not know other ways in order to allow my user to make this. Some
idea?

<a href="#" accesskey="A">[A] link</a>

<form>
<input type="text" accesskey="1" /> ????
</form>

Cetalfio