convert markdown to html in new tab

Dear Vim Scripters:

I know how to run external commands and send the output to new files and such, but I'm wondering if a Vim scripter can help me do something that has to be a common task.

Assume I have a buffer open in Vim called file.markdown

I want to run my external markdown processor of choice, say pandoc, on the contents of that buffer and have it appear in a new tab called file.html.

In other words I don't want a filter to replace the markdown. I want to run the external command and have the output placed in a new appropriately named buffer in a new tab.

THANK YOU

Rick

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