When you select the modules you wish to enable for your Manhattan classroom, you'll note that for most modules you have three choices. (To select modules, click on the Configuration button on your Main Menu, then select the first item in the list: "Select modules, change course title, semester, teacher information". All of the Configuration items are covered in Configuration.)
Which modules do you want to use? You can add and remove modules whenever you wish. Removing a module does NOT delete the data within the module!
Assignments
Disable this module
Enable this module, and allow users to hide/unhide topics
Enable this module, but don't allow user's to hide/unhide topics
Lectures
Disable this module
Enable this module, and allow users to hide/unhide topics
Enable this module, but don't allow user's to hide/unhide topics
Handouts/Notices
Disable this module
Enable this module, and allow users to hide/unhide topics
Enable this module, but don't allow user's to hide/unhide topics
...and so on...
If you choose to disable a module, a button for that module will not appear on anyone's Main Menu. Any messages posted to that module are still there, and can be viewed again once the module is re-enabled. But what does it mean to "allow users to hide/unhide topics"?
When you allow users to hide/unhide topics, the topic index - the web page they see when they first enter a module - has a few additional controls. The following is a student's view of the Handouts/Notices module:

As shown above, each message (or topic if this were a discussion module) is marked with one of three icons:
Marks unread topics,
or topics that contain messages that are unread. This icon is
not a hyperlink. If you position your mouse over the icon,
you'll see the message: "This topic has
one or more unread messages, so you can't mark it as 'sleepy'
right now." You can think of these topics as "wired" instead of
"sleepy" or tired. It's an active topic, since it
contains at least one message you haven't read.
Marks 'normal'
topics. Once you have read all of the messages associated
with a topic, the icon changes from
to
automatically. This icon is a hyperlink. If you float your
mouse over the icon, you'll see the message: "Click here to mark this topic as 'sleepy'.
'Sleepy' topics can be hidden from view by selecting the
appropriate filter above." As suggested by that 'tool
tip', if you click on the icon, the message will be marked as
sleepy and the icon will change to 
Flags topics you have
marked as 'sleepy', by clicking on the
icon. If you
click on the 'sleepy' icon, the topic's status will change
back to 'normal' and the icon will again be: 
Huh?
In other words, topics that have one or more unread
messages are marked with a
. You can't change the
status of these topics until you have opened the messages
they contain. Otherwise, you can toggle a topic's status
between normal
and sleepy
by clicking on the icon.
When you have marked one or more topics as sleepy, you can click on the "Hide sleepy topics" link above the list of messages. Starting from the above screen-shot, when the student clicks on "Hide sleepy topics" the view is now:

Note that the topic marked as sleepy in the first screen- shot "Can you read a Microsoft Word file?" no longer appears on the list. The message immediately above the list of topics tells the student "One topic you marked 'sleepy' is not listed below." and provides a link "List all topics" to restore the full list of messages. Clicking on "List all topics" would restore the page to the first screen-shot.
The purpose of all this is to allow each user to decide which topics to display within a given module. A Class Discussion module, for example, could be filled with dozens of topics by the end of an active course. Allowing your students to hide/unhide Class Discussion topics will allow them to mark older topics, which haven't been contributed to in weeks, as 'sleepy' to remove them from their list.
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If a new message gets posted to a topic, the topic
automatically "wakes up".
The icon will change to |
As the teacher, whether or not to enable the topic hiding feature is entirely up to you, on a module-by-module basis. You can safely enable/disable this feature in the middle of a course. If the teacher chooses to disable the ability to hide/unhide topics, the students' view of the Handouts/Notices module becomes:

Students (and you) have lost the ability to hide/unhide messages and all of the related icons and links are gone from the page.