[pstricks] using pstricks in pdfscreen

[Pedro Baltazar]

1- I want to use pstricks (pst-tree) in the package pdfscreen.  Is possible, 
how?

                with the comand:  pdflatex --shell-escape file.tex , appear 
this mensage
<<    Package pdftricks Warning: ****************************************
         (pdftricks)                Using \write 18 capability
         (pdftricks)                for producing PDF-figures.
         (pdftricks)                **************************************** 
 >>



2- how to label nodes in pst-tree sintax? Is possible to use pstricks 
comands in pst-tree sintax ? there is any manual to pst-tree?

3- Orther good package to make labeled trees, that worked with psfscreen?

Best regards