With Formand Report elements, macros can be assigned to certain events
A macro consists of a group of commands. The macro can be executed by the event of the component.
Macros can also execute their commands in a logical order. The commands can be part of an if-then-else construct or a while loop.
In order to implement the program cycle and the behavior of application to be developed, eva/3 provides System commands, which can be inserted into the macros.