Redirection to new web site address
How can I do current web site DNS pointing to another web site address. Let say, when user type www.abc.com in browser I wanted to change the link in browser as www.def.com and to show www.def.com.sg web site because some people know only www.abc.com but I do not want to use this abc name and abc web site any more for my company cause our company changed name from abc to def . Currently I used IIS web server. Kindly help me. Thank you all.