The document discusses the importance of list aggregation web parts in SharePoint for efficiently handling data across different sites and sources. It describes how professional editions of list aggregators can access caching to retrieve results faster and reduce server loads. The document also covers different methods for enforcing security at the column level in SharePoint lists, including conditional formatting, new field projection features, and linking lists to restrict data visibility depending on user type. Finally, it states that list aggregators are crucial for preventing intruders from accessing essential information on websites.

1. Applications on the share point platform require handling of the
information efficiently because majority of the websites are data centric.
List aggregation web part plays a very important role in running the cross
site collection queries and displays the results in an organized manner. It is
an open fact that end users frequently need to access data from varied
sources across the internet and thus requires aggregator to accomplish the
task without any hiccups. Different functional views such as the open issues
from the project sites and all active announcements are provided with the
web part as built in functionalities. Sometimes people require latest press
release from the websites and it involves sifting through the endless
labyrinth of data on the internet.
Professional edition of the list aggregator is able to access caching features
of the web part so that the results could be retrieved without additional
delay. One of the positive outcomes is the capability of the component to run
resource intensive queries from different web application. Therefore, the
web server has to face fewer loads as compared to the situation where the
conventional web part is used.
SharePoint Column permission involves multiple approaches so that
restrictions could be placed at the item or document level. Administrators
can use the functionalities of the list to allow the users to edit delete or view
the columns. One can enforce security of the column by denying
unauthorized access to the required information. Conditional formatting is
the procedure required to accomplish the task and it does a great job by
hiding the column from the users who are not intended to view detailed

2. information.
Another method involves the new features of the list such as the projection
of a field from the child into the parent. For instance, if an order list is
created by the application it displays only the address and name of the
individual buying the product however it is read-only information for the
end users. To secure the information, data is stored in two separate lists that
could be linked by a common column for running the query in an inefficient
manner. The views display both lists however the visibility depends on the
types of users accessing the information.
Share point is an essential element to establish security at the list level but
also protects the meta-data of the table. Writing additional code for
customizing the data is a wonderful prospect for the administrator to
delegate different responsibilities to the users according to their
departments. Prior to enforcing the column level permission, it is important
to make sure that the performance of the application doesn’t suffer.
Aggregator is a very crucial component in preventing the intruders from
barging into the website and stealing essential information.
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