you can not share that connection without any managable device. if you will use normal switch which we use in lan than it will give dynamic ip to any one PC and only that one will work. now it will be better for you to purchase a linksys wireless broadband router (WRT54G) it will cost around Rs. 2300. and then your wimax cpe will give dynamic ip to wireless broadband router and from wireless broadband router you can connect 4 pc by cat5 cable coz it has 4 lan port to connect Desktop System and even you will access internet from your laptop through wi-fi.