[pdftex] filled box? (like psboxit)

[Troy Goodson]

At 11:42 AM +0530 11/20/01, Radhakrishnan CV wrote:
>On Mon, 19 Nov 2001 at 11:43, Troy Goodson wrote:
>
>    How do I make a filled box like psboxit would do?
>
>    I want to use this to make a white box to cover up a line on
>    an overlay for a header/footer.
>
>\fcolorbox{linecolor}{fill color}{your boxed material}
>\colorbox{fill color}{your boxed material}

I just tried \colorbox and it works like a charm.  I couldn't find 
this command in The LaTeX Companion, where does it come from?