OneWorld gives you the possibility to access DB through various way. In OneWorld you can publish logic business function like Master Business Function, in various format: COM, java, CORBA. You can design an application (VB, VC, JAVA..) to use these objects to access OneWorld DB.
Ztable is a way to interface OneWorld with another application. You can use Real Time Event to generate real time integration with OneWorld.
Gigi