The ONLY FOR direct input field allows you to enter person-, group- or certifier names so as to only target certain user(groups):
Examples:
Mary Miller/ACME
Groupname 123
*/Sales/ACME
In case multiple Actions target the same users, you can either use (a) corresponding group(s) from the public addressbook in the direct input field, or create so called Access Definitions in the MC Configuration database for further re-use across multiple Actions.
NOTE: When checking ONLY FOR without selecting any Access Definitions and without supplying any direct input, an Action will only be deployed to users who have the role [Admin] in the MC Configuration database.
See Also
The Who tab
Specifying target users for an Action (ONLY FOR)
Selecting Access Definitions
Excluding users, groups and/or Certifiers from being targeted by an Action
Excluding users from an Action (EXCLUDE - direct input)
Under the hood of the Who tab