GW_CORE, IW_FND and IW_BEP are the software components that can be looked for. all these are having SP level 0006 which means it is SP06 system.
you can refer Installing SAP NetWeaver Gateway Components - SAP NetWeaver Gateway - SAP Library which lists out all GW components.
the component name which starts with IW_* and GW_* belongs to Gateway.
Regards,
Chandra