Please show in that documention where it says that..
Um, here...
Implementation Levels
The SMB format can be implemented to varying degrees between programs without creating compatibility issues. Rather than have developers specifically state which features they have and have not implemented, we have defined seven levels of implementation (represented by Roman numerals I through VII). For a program or software package to meet an implementation level, it must have all of the features listed for that level and all of those for each level below it. The minimum suggested implementation is level I. The SMBUTIL program included with this specification is an example of a level I implementation with features
from some of the higher implementation levels.
Level I
The minimum suggested level of implementation. Messages contain merely ASCII text displayable on an ANSI terminal. Messages can be added to the message
base and if the maximum number of messages is exceeded, messages are removed
or marked for deletion.
Level II
The addition of file attachments, multiple index/header entries per message (multiple destinations), multiple text bodies for the separation of message text and tag/origin lines (for example), forwarding, threading, and specific FidoNet kludge header field support makes this level of implementation more realistic for bulletin board system and EchoMail software implementation. Synchronet Multinode BBS Software v2.00 has a level II implementation of this specification.
Level III
This implementation adds support for translation strings defined later in this document for data compression, encryption, escaping, and encoding. This level is still limited to basic ASCII text and ANSI escape sequence entry and retrieval.
Synchronet Multinode BBS Software v2.10 has a level III implementation of this specification.
Level IV
The storage and retrieval of embedded and attached images is added in this level of implementation. Supported images are limited to single binary or text data blocks that can be displayed or transferred to the user (automatically,
or by request) if their display and translation protocols define specific support for the image type.
Level V
This level of implementation adds support for embedded and attached sound data. This includes digitized sound and MIDI data. Supported sounds are limited to single binary or text data blocks that can be played or transferred to the user (automatically or by request) if their presentation and translation protocols define specific support for the sound type.
Level VI
Localized sound and image data can be triggered by messages stored and retrieved in an implementation of this level.
Level VII
Complete multimedia support is reached in this implementation level with support for embedded and attached animation, sound, and video data.
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