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function hailed(NPC, Player)
    SetTempVariable(Player, "SpawnPointer", NPC) -- This will store the npc in a temp variable on the player who hailed it
end

function SomeFunctionInADiffrentSpawnScript(NPC, Player)
    -- Get the spawn pointer we stored in the players temp variables
    Spawn = GetTempVariable(Player, "SpawnPointer")
    -- Check to make sure the pointer is valid
    if Spawn ~= nil then
        -- Lets change that spawns visual state
        SpawnSet(Spawn, "visual_state", 1111) -- FYI - made up # for visual state, no clue if it is valid
        -- No longer need the spawn pointer so lets clear it
        SetTempVariable(Player, "SpawnPointer", nil)
    end
end