[NTG-context] on imposition and local or external files

Hi there, I would like to use imposition to rearrange an existing PDF as a booklet, but I don' have ConTeXt installed on the machine I would like to do it. Using http://live.contextgarden.net/ might do the job, but I have problems to load the local file. Is there any way to load a local file (or even an URL) with ConTeXt? How should I rewrite the following command to load a local file or an URL in ConteXt live? \insertpages[original_file.pdf][width=0pt] Thanks for your help, Pablo