you can go into the services in the control panel and set the
property of the TNSListner to automatic so that every time you boot
up, the service will be started but before that do the following
steps:
Go into your Oracle 8i home ( the path is :\network\admin),copy files
sqlnet.ora and tnsnames.ora and paste them in Developer 2000 home (the
path is :\net80\admin). These files already exist in your Developer
2000 directory, so just overwrite them but do make a copy of them
before pasting!!
After this you can easily connect from your Developer 2000 tools like
Form and Report and do remember do give the database name in the
database filed in the connect dialog box(the database name is the same
name which you chose earlier while installing Oracle 8i).
Hassan