The question is rather vague; the applications used in Unix are similar or identical to those used in other operating systems, such as Windows.
Unix is used very similarly to other operating systems (Windows, etc.) for their applications.
Unix
x windows
Cygwin is used to port applications that were written for Unix or Linux to a Windows environment.
Yes. KDE4 applications will run on Unix and Unix-like platforms (including Mac OS X) and Windows platforms.
One of the major advantages of unix based hosting is that unix is free, so the cost is not an issue. Another cost benefit is that several free applications are available for Unix based servers so the money that would have been allotted to this could be utilized elsewhere. Unix is also very efficient because less system resources are required which means less bandwidth and RAM are used. This results in a smoother and faster site. Many languages were developed using Unix as well. This means that there are more applications will be able to run on your site than if you had chosen another platform.
Actually, UNIX is an operating system. It is generally used in business applications on large mainframe computers. However, many hobbyists prefer it for its simplicity and scalability.
Bill Rieken has written: 'Adventures in UNIX network applications programming' -- subject(s): Computer networks, Operating systems (Computers), UNIX (Computer file)
Some versions of Unix are oriented towards real time applications, and processes in Unix can be "promoted" to real time status if desired. Other than that, you would have to define more precisely what you mean by real time for an operating system.
I could be linux, unix, windows flavour depending upon the the natuire of applicationan and environment.
Andrew Lowe has written: 'Porting UNIX applications to Windows NT' -- subject(s): Application software porting, Microsoft Windows NT, UNIX (Computer file)
HZ