Here's an example of what deoma03 is describing.
Suppose you searched on HTTP-Response-Code and found an HTTP 500 response.
The <rs> tag holds the response. The <rq> tag holds request information. And, the <t id="75"> contains the ID of the specific transaction having an HTTP response code of 500.
Using the identified Txn ID, you can open the VSI and locate Txn ID 75 under the operation GET /employee/{URLPARAM0}/: