1. A computer program product for identifying details of a flow of multiple transactions and generating a visualization of a topology of the flow of multiple transactions, the computer program product comprising: a non-transitory computer readable storage media; first program instructions to detect that a first computer system has received a current transaction initiation request from a precursory transaction, wherein detecting that the first computer system has received the current transaction initiation request from the precursory transaction is performed by a monitoring computer; wherein the current transaction initiation request is for an initiation of a current transaction in the first computer system, wherein the precursory transaction is part of a flow of other transactions that are upstream from the current transaction and that are initiated by a set of interconnected computer systems, wherein the current transaction initiation request contains parameter information that is recorded by each computer in the set of interconnected computer systems on which a transaction in the other transactions is executed, and wherein the parameter information comprises: a flow transaction identifier that identifies all transactions in the flow of other transactions that are upstream from the current transaction; a hop count that identifies how many computer systems have received other transaction initiation requests in the flow of other transactions, and a transaction initiation count that identifies how many transaction initiation requests have been transmitted in the flow of other transactions within each of the interconnected computer systems; second program instructions to identify the flow of multiple transactions based on the flow transaction identifier and an identifier of the current transaction in the first computer system; and third program instructions to generate a visualization of a topology map of the current transaction and the other transactions based on information in the parameter information from the current transaction initiation request; and wherein the first, second, and third program instructions are stored on the non-transitory computer readable storage media.