Crop Marks in output and metadata

[Jesús Guillermo Andrade]

Thanks all for your help in my previous question. I am trying to set  
up crop marks into the pdf the comes out from lily. Is that possible?  
If so, there must be a way to specify its size or apearence as in  
TeX... right?
Also, how can one put metadata into the resulting pdf? So far, not  
even the title string comes out into the final pdf. (Perhaps Im doing  
something in the wrong way)

Thanks a lot.... again

Guillermo