Hello, it is more a general question than a chemical one. I have huge amounts of pdf files. I often would like to add a note like a "post-it" and be able to retrieve this later including this note. Can you recommend a software which is able to do such things ? OS: either Linux (preferred) or Windows And another question: is there a fileformat preferable to pdf ? Thank you chemweb: A list for Chemical Applications of the Internet. To post to list: mailto:chemweb@ic.ac.uk Archived as: http://www.lists.ic.ac.uk/hypermail/chemweb/ To (un)subscribe, mailto:majordomo@ic.ac.uk the following message; (un)subscribe chemweb List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)