Multiple versions of TNSNAMES.ORA ?

Something a DBA told me once ...  

"In a UNIX client machine, it is possible to create an equivalent of TNSNAMES.ORA in $HOME that over-rides (or adds to) the one in $ORACLE_HOME/network/admin"  

Is this statement True or False ? If true can you please point me towards more information regarding this ...  

thanx
deepak  

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