When enabling both the "ALL" and "At least ONE" list of Conditions on the When tab, both lists can be logically combined using either AND or OR:
Example 1:
[Client has 2 GB of memory] and [Client has 2 GB of free disk space]
AND
[Client is in IP segment A] or [Client is in IP segment B]
Example 2:
[Client is laptop] and [Client is in IP segment C]
OR
[Client is Desktop]
See Also
The When tab
Specifying how often an Action is supposed to run (Repeat interval)
The "Keep local exec. info" option
Configuring a maximum number of executions
Selecting one or multiple conditions of which ALL must match for an Action to execute
Selecting one or multiple conditions
Selecting one or multiple conditions out of which At least ONE must match for an Action to execute
Restricting an Action to only run for users with a specific home/mail-server