Checking the page load completely
I just wonder .. is there anyway that we could check to see if the java frame has been completely uploaded. Or is there any return value from VNC.
I take it that the "java frame" is a memory construct and not an interface element? No, there's no "return value" from VNC and there's no information from the SUT regarding things going on in its memory space. The VNC server sends nothing back except screen and clipboard updates.
Can you say more about exactly what you are trying to do and what problem you are trying to solve? It might be easier to provide you with an answer if we knew specifically what the issue is.