This Method initializes a single Portal.ArcGISPortalGroup. Portal.ArcGISPortalGroup objects are collections (aka. groups) of items, usually related to a specific area of interest such as maps (aka. WebMap), applications, and tools. Groups allow members to contribute items as a useful way to collaborate. This Method finds a specific group within ArcGIS Online (AGOL) or ArcGIS Portal by providing the Id value.

You do not have to be a logged in user using the IdentityManager to get information from this Method. You can gain this information from anonymous access. However, to obtain information about an group that has a Portal.PortalAccess level of Private or Shared you need to use the IdentityManager by supplying the appropriate username/password credentials. As AGOL and ArcGIS Portal require the use of long term tokens to access secured information (i.e. information that is Private/Shared), you should remember to set the IdentityManager.TokenGenerationReferer Property to the correct string required by your development platform.