// This will cause all other prims of the current object to blink on and
// off continuously (appear and disappear)
integer  flip;
default
{
    state_entry()
    {
        llSetTimerEvent(0.5);
    }
    timer()
    {
        flip = !flip;
        llSetLinkAlpha(LINK_ALL_OTHERS, flip, ALL_SIDES);
    }
}