expression

    Specifies an entity to be monitored. With high-level languages,
    this is typically the name of a variable. Currently, MONITOR does
    not handle composite expressions (language expressions containing
    operators).

    If you specify the name of an aggregate variable (a composite
    data structure such as an array or record structure), the monitor
    view lists "Aggregate" for the value of the variable. You can
    then double-click on the variable name to get the values of all
    the elements (see context-sensitive Help).

    To specify an individual array element, array slice, or record
    component, follow the syntax of the current language.