There is a possibility to filter files that are uploaded to the BBS. This is done by a F_FILTER program. The F_FILTER may also be created as a DLL. Both for WinFBB and DosFBB (!!). The filter must be installed in the path (\FBB\BIN) of Dos. If the F_FILTER exists, the temporary file is no longer deleted by WinFBB (unless return value from F_FILTER is 0), the filter must decide what to do. F_FILTER receives as parameter a file in which are given information such as asked filename and label. If F_FILTER returns 0, then the file is normally recorded (and the temporary file is deleted), else nothing is done by FBB. The text returned by F_FILTER will be sent to the user. So an archive may be compressed, scanned, and a report may be sent to the user. This can be done in real time or delayed.