The showme command also allows you to read selected parts of documents, specified using the cross-reference labels they contain. To do this, you simply add the label as an extra argument. Thus:
showme sun188 hlink
will display the description of the hlink command in this document.
Using this feature requires that you know the names of the cross-reference labels present in the document, or at least requires that they be easily guessable. If this is not the case, you may prefer to select which parts of documents to view by means of a document search instead.