I have a working module which opens a modal form with CTools. However, I must use the URL example.com/mymodule/page . There the module creates the link which opens the modal window with the form. How can I use the link in other pages? I have tried to just put the link and it does not work, it redirects to the page of the link (example.com/mymodule/nojs/) instead of opening the modal window.
I have finally solved the problem and now everything works: the modal window, the form and the submit, sending the email in final step. The problem was that the raw URL included the class ctools-use-modal-processed and apparently that simple css was making it not work. Now more or less understand the process, thank you for your help, it has been very valuable.