" I am building a C/S app. , but when i tried to run my app. at the
cleint side i got the error 'RPC not available' , any help ?!
(i have the DCOM installed in both machines)"

You can download dcom1.2 at www.microsoft.com/com
the server:
   install dcom95.exe;(the download file)
   config:
         HKLM\software\microsoft\ole:   EnableDcom = 'Y';

EnableRemoteConnect = 'Y';

LegacyAuthenticationLevel='1';(DWORD)
  reboot;

the client:
    Install dcom95.exe
    copy the dbclient.dll, stdvcl.dll to : NT: systenm32;
                                                                      W95 :
system
   copy the client application to local matchine.

you can get more help at:
    www.execpc.com/~dmiser/dcom95.htm