Service page of the Test Info pane varies depending on which
service plug-in is selected in the pop-up menu at the top; the picture
above shows the Web (HTTP) service. When you choose a service from
this menu, the fields below change accordingly.
A service is a particular configuration of a service plug-in. A service plug-in does the actual work of checking the tests. There can be multiple services based on the same service plug-in, e.g. the IMAP, POP, SMTP, and SSH services are all variations of the Port Service Plug-in, each using a different port and with different session scripts. Similarly, the FTP Directory Listing, Samba SMB, Screenshots, and other services are based on the very versatile Script Service Plug-in.
You can add your own services, or modify these, via the Liste des services.
The default services are as follows. Click each to read more about them: