Give NC when sitting down

default
{
    state_entry()
    {
        // set sit target, otherwise this will not work
        llSitTarget(<0.0, 0.0, 0.1>, ZERO_ROTATION);
    }

    changed(integer change)
    {
        if (change & CHANGED_LINK)
        {
            key av = llAvatarOnSitTarget();
            if (av) // evaluated as true if key is valid and not NULL_KEY
            {
                llGiveInventory(av, llGetInventoryName(INVENTORY_NOTECARD, 0));
            }
        }
    }
}