This article is from the Charmed FAQ, by Colin A. McGregor (firstname.lastname@example.org) with numerous contributions by others.
Sort of and no. There are sites that do offer downloads of Charmed
episodes over the Internet (for which you will want some sort of high
speed internet connection, be it xDSL, cable modem, T1, OC3, or
whatever). When it comes to Charmed downloads be warned that in most (if
not all) nations this sort of activity is illegal, and if legalities
concern you then stay away. As for watching "live" broadcasts of Charmed
via the Internet answer appears to be no. "JumpTV"
(http://www.jumptv.com/) does offer live streaming video feeds from some
TV stations. However, while I have not checked out all of the non-English
language stations that "JumpTV" carries, it would appear that at least in
English, Charmed is not available.