When you really get to know the advanced functions in Microsoft Excel, one function that you will no doubt begin to use frequently is the IF function. In automating your calculations and data manipulation, the IF function will give you some of the same features that professional developers often use to design programs.
Pointer (PTR) resource records that are created automatically when you add a host (A or AAAA) resource record to a zone will be deleted automatically if the corresponding host (A or AAAA) resource record is deleted.You can complete this procedure using either the DNS Manager snap-in or the dnscmd command-line tool.lick OK to add the new record to the zone. To add a pointer (PTR) resource record to a reverse lookup zone using a command line. Open a command prompt. To open an elevated Command Prompt window, click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
1 Host Name: The unique identifier that serves as name of your computer or server can be as long as 255 characters and consists of numbers and letters.  Physical Address: Refers to the physical address of the Ethernet connection to your computer or server.