Each item has 3 different states :alive, shutdown, unknown(displayed by different icons ), and would notify administrator when "alive" and "shutdown" states change. NBT Host Monitor owns following advantages : (1) A tool which provides parallel watching, NBT Host Monitor's parallel detecting method is much sensitive, while traditional in-turns method sometimes results in long interval-time when there are too many IP devices to be watched such as "nbtstat". (2) Rich dealing means such as music, box warnings, network messenger, syslog, mails to as many as 256 administrators, running related program, (the program can be developed by administrators, which provides flexibility). (3) Macro parameters. When popup dialogbox or running related program, the content/title of mails could both be set by administrators, and the content could contain macro, which can be replaced by other content in real situation.