I have used the High Command Module in a multiplayer mission and found a few problems.
1- Icon colours appear the same for both sides (eg OPFOR / BLUEFOR).
2 - Enemy icons do not disappear when the units are not in line of slight .... This means if you locate one unit you can view its location for the rest of the mission
Create mission with High Command Module, place blufor/opfor/CIV/Greenfor units and launch it on dedicated server - markers for all sides will be blufor
1st screenshot - how it woks on dedicaterd server
2nd screenshot - how it works on SP/LAN
Wrong marker colors really make a lot of troubles in multipleyr. I hope it will be fixed.