I found Active scanning option, it will find all computers in domain (or OU if I specify). So I guess that it scans only Active directory, all computer objects. So if I have computer object in AD, but that computer doesn't exist (computer physically removed but account not deleted), it will report it in Lansweeper anyway ?
IP range scanning is not implemented (if the xp firewall is on it's useless anyway) You can autodetect your clients with lsclient in a login script or with active scanning.