*Automatically invoked when exiting `EDIT.SYSTEM` when using W)rite, F)orward or R)eply in `EMAIL.SYSTEM`*
`ATTACHER.SYSTEM` is used for attaching files to outgoing email messages. This program is started automatically by `EDIT.SYSTEM` and is not normally invoked directly.
When `EDIT.SYSTEM` invokes `ATTACHER.SYSTEM`, the following operations occur:
- The outgoing email message is loaded from `OUTBOX` and copied to a temporary file. While copying, additional email headers are appended to indicate that this is a MIME multi-part message.
- A `plain/text` MIME section header is added to the email body (which becomes the first section in the multi-part MIME document.)
-`ATTACHER.SYSTEM` prompts the user to enter the filename of a file to be attached. This may be an unqualified filename (which will look in the directory the emai//er software is installed in), or a fully-qualified ProDOS pathname, such as `/H1/PATH/TO/MY/FILE.BIN`.
- For each filename, the file is loaded from disk and encoded using Base64. A MIME section is created in the outgoing email and the Base64-encoded file data is appended.
- After all the desired files have been added, enter an empty line to finish adding files.
-`ATTACHER.SYSTEM` will terminate the MIME document, erase the original email file from `OUTBOX` and rename the temporary file to replace the original.
-`ATTACHER.SYSTEM` will reload `EMAIL.SYSTEM` once it is done.
