scripting and ASP.Net

Question

for those who are experienced in either ASP or ASP.Net (also scripting) kindly share your knowledge on the following: 1. is there a way i could save a file (.txt) on clients local hard drive (aside from yummy cookies)? pls don't say activex control or applets 2. can javascript read/interpret ASP/ASP.Net sessions/application? 3. if i embed some javascript codes on a server control (runat="server", autopostback="false") so that processing is done on client-side will not the control trip to server?