Get Permalink of Network Blog Post

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That sounds pretty simple.

Use: http://codex.wordpress.org/Function_Reference/switch_to_blog

To go back use:

restore_current_blog();

This allows you to switch from site to site.

Then: http://codex.wordpress.org/Function_Reference/get_permalink

My assumptions are that you have both the Blog ID and the Post ID.

If that’s the case – using those two functions should solve your problem.