How Altiris handle PC redeployment with different hostname and IP (Same hardware)

Dear all,

I have a PC "host1" reinstall from WinXP to Win7 and changed the hostname to "host2" (same hardware but IP is changed).

I re-discovered it but altiris still use "host1" name on that PC.

1) Can altiris detect the changes on the above situation?
2) What should I do to let the Altiris record update this PC from host1 to host2?

3) Similar situation, how can I check if a PC is changed hardware(Whole PC model, RAM or harddisk) but hostname haven't changed?

Thanks.

Background:

I have a All-in-One Altiris Notification Server 7.1 (Virtual Machine) for PC inventory & software deployment with MSSQL database 2008 R2.