Oracle 10g XE max connections

My works_perfect_onOracle9i_after_fours_years application (Delphi 5, DOA 4.02, XP Pro, SuSE Linux Oracle Server) works fine too in a 10g XE database (10g XE Windows Client), but only for 4 or less connections. When i open the no. 5 connection (Pl/SQL, SQLPLUS or even my application) the login attempt raise the ORA-12520 error. I not found nothing about connections limitations on Oracle Express Edition, and i change some parameters in the init.ora, but the error still occours.

Can someone help me, please ?
 
In fact, the error is ORA-12516: (TNS:listener could not find available handler ...) . The ORA-12520 occours only with 9iClient accessing 10g XE server, with the directive "SERVER = DEDICATED" in the tnsnames.ora service name section.
 
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