+-------------------+
 |   Authentication  |
 |       Agent       |
 +-------------------+
 | libpolkit-agent-1 |
 +-------------------+
        ^                                  +--------+
        |                                  | Client |
        +--------------+                   +--------+
                       |                        ^
                       |                        |
User Session           |                        |
=======================|========================|=============
System Context         |                        |
                       |                        |
                       |                    +---+
                       V                    |
                     /------------\         |
                     | System Bus |         |
                     \------------/         |
                       ^        ^           V
                       |        |      +---------------------+
        +--------------+        |      |      Mechanism      |
        |                       |      +---------------------+
        V                       +----> | libpolkit-gobject-1 |
+------------------+                   +---------------------+
| org.freedesktop. |
|    PolicyKit1    |
+------------------+
|   Backends and   |
|    Extensions    |
+------------------+