The configuration files was config.txt in R11i which plays important role in restart.In R12 it is called conf_SID.txt. It is used where database is not yet created.
Configuration file stored in three important locations:
a) $INST_TOP - Permanent
b) $ORACLE_HOME/appsutil of Database 10g R2 - Permanent
You can copy this config file to other machine where you want to use this config file to restart the install in which Rapid install did not get as far as creating the database.