DoNotDisturb is a nice, free software only available for Windows, belonging to the category Security software with subcategory Blockers & Access Control (more specifically Specific Applications).
More about DoNotDisturb
It's available for users with the operating system Windows 98 and prior versions, and you can get it only in English. The program version is 2.3 and was updated on 7/24/2006.
Since we added this software to our catalog in 2006, it has managed to reach 1,390 installations, and last week it achieved 0 installation.
About the download, DoNotDisturb is a fairly light program that doesn't need as much storage space than the average program in the section Security software. It's a program frequently downloaded in Finland.