Searching for a mac is currently not supported (but a good idea for next version)
report would go something like this:
SELECT TOP 100 PERCENT dbo.tblComputers.Computername, dbo.tblComputers.Domain, dbo.tblNetwork.Description, dbo.tblNetwork.IPAddress,
dbo.tblNetwork.MACaddress
FROM dbo.tblComputers INNER JOIN
dbo.tblNetwork ON dbo.tblComputers.Computername = dbo.tblNetwork.Computername
ORDER BY dbo.tblComputers.Computername