Pjlmon.dll is a language monitor that supports bidirectional PJL language support.
For Windows 8, the sample source code for Pjlmon.dll is available in the pjlmon directory in the Windows Driver Kit (WDK) 8.0 samples archive repo on GitHub.
For Windows 8.1, the sample source code for Pjlmon.dll is available in the pjlmon directory in the Windows Driver Kit (WDK) 8.1 samples archive repo on GitHub.
Note
GitHub の Windows Driver Kit (WDK) 10 サンプル リポジトリの Pjlmon.dll では使用できないサンプル ソース コード。