Use any of the operators listed under Properties, Operators in the right-click menu to define how a property relates to the specified value.
You can use the conditional operators AND and OR to enter complex patterns for a single event type. This example returns all events occurring on server1.ca.com with a severity of Critical:
Severity='Critical' and MdrProdInstance='server1.ca.com'
All operators are case-sensitive. Using the right-click menu ensures the correct case and format for operators.