users on a LAN

i need code for retrieving computers that are curently connected to a LAN, regardless if they are on or off. thx..

PS: is it also possible to get a list of users that are logged onto the computers at a particular time?

Do try the search function on the forums. Most people ask it under 'enumerating computers in a network'

http://ww.mvps.org/vbnet has sample code for enumerating computers in a network. Use the search.