(eplain.info)Turning hyperlinks on/off for a group

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5.6.2 Turning hyperlinks on/off for a group
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If you want to disable links/destinations produced by certain groups,
you can give a list of the groups as an optional argument to these
commands:

     \hldeston[GROUPS]
     \hldestoff[GROUPS]
     \hlon[GROUPS]
     \hloff[GROUPS]

where GROUPS is the list of linkgroups/destgroups. This list can contain
two special groups. The empty group switches the low-level commands
(Note: Turning low-level commands on/off), and the star ('*') group
operates on all defined groups.

   Note that turning off the low-level commands disables all hyperlinks
globally, including groups which have them enabled. Turning off certain
linkgroups/destgroups records the fact that the macros in the group
should not produce links/destinations. To illustrate the distinction,
assume that all links are on; after the following sequence of commands:

     \hloff
     \hloff[eq]
     \hlon

all links are on except for the 'eq' linkgroup.