1. A method for monitoring operations of a specified transaction server that has an associated network topology, wherein said method comprises the steps of: defining a plurality of zones within said network topology; assigning one or more monitoring agents to each of said zones, wherein each agent is adapted to selectively run synthetic transactions with said specified transaction server; monitoring results of successive synthetic transactions carried out by said monitoring agents, in order to detect any errors associated with said successive synthetic transactions; and in response to detecting a problem associated with a particular synthetic transaction run by a particular one of said monitoring agents, a normal mode of operation, wherein said monitoring agents are respectively scheduled to run said synthetic transactions at pre-specified times, is overridden and a dynamic scheduling mode is invoked wherein certain ones of said monitoring agents are respectively scheduled to run said additional synthetic transactions immediately following detection of said problem associated with said particular synthetic transaction, wherein each additional scheduled transaction is selected because of a specified relationship with said particular synthetic transaction.