Problem with Informix IUS 9.12?

Hi, I have wrote a Java applet to connect and retrieve data from the IUS using Informix RMI classes in Windows NT 4.0. But I wonder why after a few retrievals of data ( less than 10 ), the database server prompt me that memory allocation cannot be performed or client thread cannot be created. This happens even after I tried to increase the memory from the System option in Control Panel. Am I missing something? Do I have to set the page higher (if so, how?) or explicitly some command line commands using oninit? Thanks in Advance, Aik Khoon