The thread title says it all. Supposedly, DirectStylus support is built in at the processor level on the K1. I just ordered a replacement DirectStylus from Amazon to try this out when I get my N9.
It might work like a normal stylus, but it probably doesn't have the Directstylus software to enable high speed accuracy or palm rejection. Based on what I've seen the touchscreens are calibrated to certain size "touch" targets, so some will work if the touch is finger size but not smaller than that. Others may respond to fine tip touch.