[pdftex] How to set TrimBox, BleedBox in LaTeX or PS

[josef dev]

Dear All, 

  Can anyone tell that how we can set the TrimBox, BleedBox using LaTeX 
commands or directly in PS file using postscript commands to appear 
same in resulting PDF when viewed in Acrobat. 
  
I understand that in PDFLaTeX one can set this using \pdfpageattr and 
\pdfpagesattr but I want to know that how we can achieve same in LaTeX 
or in resulting PS using postscript command or pdfmarks for the same. 

  Regards 
  David 


 		
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