As explained on user manual, you can use :
${url} : url to get the direct link to the item
${goto} : display Class and Id of item, clickable to have direct link to the item

Thanks Babynus.

I sought before in the online help but don't find the section which give me information.

can you tell me where it is ? 🙂

Go to screen "Email template" (where you define the template)
Hit F12 :you're at the right place

I tried but F12 lauch always a particular screen on my browser (IE, Firefox, Chrome) : a screen which help me to debug the code of the page where I am

Is there anther solution ? keywords for example ? I tried with "mail template", "template", "mail" but I don't find 🙁

I've found with the search criteria "email template" 🙂

Sorry, it's not F12 (dev tools) but F1 (help)