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what does "halo" mean in WRF code

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When using multiple processors, your domain is divided up into a grid, based on the number of processors you are using - 1 processor is assigned to each grid cell. Each grid cell has a halo region that consists of a few rows (minimum of 5) on each of the 4 sides. The halo region is used to pass grid information from that particular grid cell to its neighboring grid cells.
Mr. kwerner

I need to use neighboring grid cells information on particular processor.
For example, I want get No.2 processor's information when I am in No.1 processor.
Do you know how to get the information from neighboring grid cells?

And I have asked the question at another link.

Thank you
I can see in the link to your question on another post, that you already received a reply. Please try to refrain from posting the same question multiple times throughout the forum, as it adds to the time we must spend to respond to questions. Thanks!