When you use zlib compression, you can configure the upload and download compression using the zlib_download_window_size option
and zlib_upload_window_size option. Using these options, you can also turn off compression for either the upload or the download.
When linking your application directly against the static UltraLite runtime, call ULEnableZlibSyncCompression( sqlca ) to link the zlib functionality directly into your application. Otherwise, mlczlib12.dll must be deployed.