Check the Oracle 11g R2 installation type
Are you talking about the Oracle Client?

In that case you can review the installation logs in the Oracle Inventory directory and look for the INSTALL_TYPE property:

INFO: INFO: ---------------------------------------
INFO: INFO: Starting to setup InstallClient
INFO: INFO: Initializing setup InstallClient
INFO: INFO: Session Details :
INFO: ---------------------------------------------------------------------
INFO:  PROPERTY                                               VALUE        
INFO: ---------------------------------------------------------------------                         
[...]
INFO:  INSTALL_TYPE                                           Administrator