first, you are still living with a very old version of oracle. try to get upgraded. Becuase
-> you more advanced versions
-> availablity of TechSupport. In event of any catastropic failure, oracle corp will not support ur database.
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(1) I am not able connect from client (98) oracle database (novell 4.11) . i did net easy with spx service.
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what kind of error are u getting? post the exact error message and ur sqlnet.ora, tnsnames.ora , listner.ora.
is the listener configured properly, up and available?
are the spx protocol services enabled? is there any preference for using spx? 
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(2) how i check database working or not on server and tell me how to confugure neteasy on server (novell 4.11)[/i]
do the following in the database server.

make sure the datbase is up and available.
use svrmgr ( or sqldba?..i forgot i beleive sqldba is for oracle versions less than 7.3 , for 7.3 it is svrmgr ) to login to database
and start it manually ( in case it is down).
use 
   lsnrctl status < your_listener_name > -- to check the status of listener.

do the following in your client
net easy config assitant is a gui tool.
select your protocol, host,sid,port and create a service(connect string).
or simply edit your tnsnames.ora