Help: strang problem about rsh

I have two computers both with rshsvc service installed, one is named
'server', and the other is named 'client'. There is a shared
directory(named "SharedDocs")on 'server', which could be visited by
everyone. What I want to do is to visit "SharedDocs" via rsh to
'client' from 'server', namely, I want to visit "SharedDocs" from
"server" (If you want to ask why I did so, I'd tell you that parrallel
computation need this) by:
server>rsh client dir "\\server\SharedDocs"
Unfurtunately, the command above failed with "Access denied".
To figure out where the problem arose, I execute the following commands
on "server" and "client"(the name proceeding '>' is the computer on
which the command is executed):
server>rsh server dir \\server\SharedDocs #success
server>rsh client dir C: #success
client>dir \\server\SharedDocs #success
server>rsh client dir "\\server\SharedDocs" #failed: "Access
denied"

Any hints will be approciated.

Shixin