The core INI files and the PHP files will be syntax checked before being saved.
But until the real data editor is finished you will have to be careful about misspellings and missing required configuration settings.
get will download the file being edited.
put will upload and overwrite the file being edited — the name must be the same as the one downloaded for that file.
Downloaded files will have _ for the path character; when uploaded, the _ will be converted back.