Pro*C TwoTask Connect error 2732

When compiling a Pro*C program under Oracle 7.0.15 (Solaris 2.2) it works fine if used with ORACLE_SID, but fail with if used in a TWO_TASK environment. I tought we were using SQL/Net V2, but this message relates to SQL/Net V1! There is no sqlnet file for V2! What's wrong?

02732, 00000, "osnrnf: cannot find a matching database alias"
// *Cause: Database alias specified was not identified in either

//           $HOME/.sqlnet or /etc/sqlnet.


// *Action:  Create the alias in a file called .sqlnet in your home directory


//           for personal use or ask your system administrator to create the
//           alias in /etc/sqlnet for system-wide use.

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 Stephane Hamel, Sysadmin/DBA *.mais.hydro.qc.ca
 Hydro-Quebec TDSB, Montreal, Quebec
 E-mail: shamel_at_mais.hydro.qc.ca  Voice: (514) 858-7704