How Do i send auidio by LAN or Wireless like bluetooth does

i got a bluetoth interfase in my laptop an it can conect to my desktop so i play a song in itunes and it sounds in the other computer, it creates a sound driver in my laptop a bluetooth driver. the question is: Can i, somehow, do the same by the wireles lan conection so the signal rangedoes't be so short? what do i need to instal, or do i have to buy someting??