… and progresses to the right. Note that student H works on the problem by himself. Students D, E, and F separately tackle the problem by examining the replay of the synchronous … Fu sio n: A Too l th at Su p po rts Exp er ien ce, Ref lection , and Co llab or ation , A pp le Co mp u ter ACO T Rep or t, Cu pertino . [2 ] Bro wn , A . & P alin cs ar, A . ( 19 89 ) . G … P ietr ow icz, S ., an d S eg uin, C. (1 9 98 ). J av a Ob ject- S haring in H ab an er o , Com mu nicatio n s of th e ACM, 41 , pp 69 -7 6 . [4 ] Cheik es , B. A ., G eier , M., H ylan d, …