A Power User is a user having rights to create tickets On Behalf of others. Those settings affect which possilities should be available for create tickets On Behalf of others. But it also affect which links are available in My Tickets in Self Service Portal.
This option contains those settings:
•Enable Power User functionality: When this setting is enabled a checkbox, On behalf of, is displayed in the Ticket form allowing user to choose another user for whom the ticket is created (requires besides this user has been assiged Power User permissions). In My Tickets list links for My open/closed Power User tickets will be available showing a list of tickets you have reported On Behalf of others.
•The next two settings are toggling, only one can be enabled (if none of them is enabled all users in the system could be selected in On behalf of:
o Allow only for own organization. This will override other permission settings: You can choose only users belonging to same (your) organization in On behalf of. The list Open/Closed Tickets in organization contains ticket created by your organization.
o Allow own organisation + organisations given by roles: You can choose users in your organization and users in organizations you have got permission via a role you have been assigned.
•Show organization link in SSP: This selection enables a link in Self Service Portal, My Tickets. It is possible for End User to display a list of tickets created by his own organization regardless which user submitted the ticket (or own + other organization user has got permission to).