Need to find the best JSDL docs ? How to poke into Overlay mem in JSDL?

Need to find the best JSDL docs ? How to poke into Overlay mem in JSDL ?

Looking at one set of JSDL docs … I could not see how you would write into the Overlay memory after locking it ?

Where are the most uptodate docs ?

And should I be able to write to the Overlay from Java ?

I see lock and unlock methods but no way of writing to the memory.