Yes, that's possible. All you need: a scanner, a fax modem (dial-up, not adsl or cable) and fax software.
Fax software is built into Windows XP, but Microsoft left it out from Vista, so you'll have to buy a program then.
Kees
Hi,
Mubeen here.
i havn't fax machine. i want use my computer as a fax sending machine. is it posible