With MapNotes you can send map notes to other people. It will place a mark on their map. You could set 'waypoints' if your goal was to show a trail how to get from A to B.
In theory you could modify MapNotes (with a lot of xml elements for every line piece) to connect mapnotes.
I don't think the minimap graphics are stored in interface.mpq, so you wouldn't be able to send someone else a picture of an area as they'd see it on the minimap.
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