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1) Entered is sent by a sector when a thing enters it.
| Sender: | The sector that was entered. |
| Source: | The thing that entered it. |
| Sender Type: | Sector (5). |
| Source Type: | Thing (3). |
2) Entered is also sent by a surface or thing when something is attached to it.
| Sender: | The surface or thing that something was attached to. |
| Source: | The thing that was attached. |
| Sender Type: | Thing (3) or Surface (6). |
| Source Type: | Thing (3). |