Examples/Different link parameter options

all (default)
Setting the parameter "link" to "all" means that the results, i.e. the requested pages as well as the requested printouts will be linked. This is the default setting.

Since this is the default setting one does not explicitly have to state  in the query:

none
Setting the parameter "link" to "none" means that neither the results, i.e. the requested pages nor the requested printouts will be linked.

subject
Setting the parameter "link" to "subject" means that the results, i.e. the requested pages will be linked but not the requested printouts.