Companies can just monitor employees' use or set up the program to automatically block their access to certain sites.

In some cases, censorship of certain sites has been removed.

At some points, it was difficult to get onto certain sites, or get the video, because of high traffic.

Please also remember that my office can assist you with congressional tours of certain sites.

Students may go to a certain designated site to view the lecture online at a time which is convenient for them.

Through this relationship, they can also be a record of the life force that exists at a certain site.

But there are certain sites that, biologically, may be less able to take groups of visitors.

House pits and stone tools have been found in association with certain sites.

There are certain sites that just don't work well with IE9.

Anyone who works where hardware solutions to control access to certain sites will know how hit and miss this can be.