Use this dialog box to change real or effective user or group IDs for the command or whole directory of commands shown in the Command or Directory field.
You can type in a user or group, or select from the user or group list.
Effective user and group IDs are used for access control to protected resources, while real user and group IDs are used for establishing ownership and responsibility. For example, when a user creates files, the files are created with the users' real user and group IDs, but the ability to open a file is based on the effective user and group IDs.