If the number entered at the prompt has a 'g' suffix (e.g., 123g), then Lynx will make the link corresponding to that number the current link, paging as appropriate if the link does not appear in the currently displayed page. The 'g' suffix is implied (need not be entered) for form fields in Links and form fields are numbered mode.
Alternatively, if the number is given a 'p' suffix (e.g., 123p), Lynx will make the page corresponding to that number the currently displayed page, and the first link on that page, if any, the current link. The 'g' and 'p' suffixes thus convert the Follow link (or goto link or page) number: feature to an advanced navigation aid.
If the user has set Keypad mode to Numbers act as arrows, then only '0', rather than every number, will be treated as an F_LINK_NUM command for invoking the Follow link (or goto link or page) number: prompt. The '0' will not be treated as the first digit for the number, or number plus suffix, entry.
Numbers are associated with form fields only when Links and form fields are numbered mode has been selected. If you have selected Numbers act as arrows or Links are numbered mode, you can seek form fields in the document via WHEREIS searches for strings in their displayed values. If they are INPUT or TEXTAREA fields with no values as yet, you can use two or more underscores as the search string, because underscores are used as placeholders for form fields in the displayed document.
When you have invoked a popup window for a list of OPTIONs in a form's SELECT block, each OPTION is associated with a number, and that number will be displayed in Links and form fields are numbered mode. In any keypad mode, the F_LINK_NUM ('0') command will invoke a Select option (or page) number: prompt, and you can enter a number, and optionally a 'g' or 'p' suffix, to select or seek an OPTION in that list. If only an number is entered at the prompt, the corresponding OPTION will be selected and the popup will be retracted. If the 'g' suffix is included, then you will be positioned on the corresponding OPTION in the list, paging through the list if necessary, but it will not be treated as selected unless you enter the ACTIVATE (RETURN or right-arrow) command when positioned on the OPTION. For purposes of paging (e.g., in conjunction with the 'p' suffix), a page is defined as the number of OPTIONs displayed within the vertical dimension of the popup window.
Note that HTML can be structured so that it includes hidden links, i.e., without a visible link name intended for ACTIVATE-ing the link. Such links may be created, for example, by making an IMG element the sole content of an Anchor element, and including an ALT="" attribute name/value pair to suppress access to the link when the browser does not have support for image handling available. They also can be created by having truly empty Anchor content, in cases for which the value of an Anchor's HREF attribute is intended as a navigation aid for robots (typically indexers) and not as content for a browser's rendition of the document. With the -ismap command line switch, Lynx will additionally treat a link to a server-side image maps as hidden if there also is a client-side map for the same image. Finally, in some cases links which are not intended to be hidden may effectively become hidden links because of bad HTML. The hidden links differ from Anchors which have only a NAME or ID attribute name/value pair (intended as positioning targets from other links which do have HREF attributes and values that include a fragment).
Lynx respects instructions for hidden links and normally does not include them in the rendition of the document. However, if the command line switch -hiddenlinks=merge is used, such links will still be numbered in sequence with other links which are not hidden, and if Links are numbered mode is also on, link numbers will appear for them in the displayed text (except for links to image maps which are hidden because of -ismap). If -hiddenlinks=listonly or -hiddenlinks=ignore is in effect, hidden links will not be shown in the text even in links are numbered mode. Not using a -hiddenlinks flag at all is equivalent to -hiddenlinks=listonly.
If a document includes hidden links, they will be reported, with appropriate labeling, in the menu created for the LIST ('l') command, unless -hiddenlinks=ignore is used. They can then be ACTIVATE-ed via that menu. Also, if a link was hidden due to an ALT attribute in an IMG element, it will be converted to a visible link whenever the IMAGE_TOGGLE ('*') command is used to create links for SRC attritute values of IMG elements, because this indicates that the user does have some form of image handling enabled via a helper application, or wishes to download files for subsequent use with a graphic browsers or other suitable software.
HTML forms also can have fields with a HIDDEN attribute, indicating that a name/value pair for the fields should be included in the content submitted for the form, but the value should not be displayed in the rendered form. Lynx respects this attribute as well, and neither displays the HIDDEN field, nor assigns it a number for the F_LINK_NUM ('0') command and Links and form fields are numbered keypad mode handling, nor includes an entry for it in the menu created for the LIST ('l') command. However, the HIDDEN name/value pairs are included in any displays of submitted form content in the Information about the current document that is invoked by the INFO ('=') command.