There are 2 common tests performed: amniocentesis and chorionic villus sampling. ï· Amniocentesis is generally performed at between 14 and 18 weeks gestation for genetic testing. It is performed by withdrawing a sample of amniotic fluid from the mother through a needle. inserted into the amniotic sac.
Daemon is a process that runs in the background and performs a specified operation at predefined times or in response to certain events. The term daemon is a UNIX term, though many other operating systems provide support for daemons, though they're sometimes called other names. Windows, for example, refers to daemons as System Agents and services. Typical daemon processes include print spoolers, e-mail handlers, and other programs that perform administrative tasks for the operating system. The term comes from Greek mythology, where daemons were guardian spirits.
A demon (also see daemon which has a somewhat similar meaning) is a program or process, part of a larger program or process, that is dormant until a certain condition occurs and then is initiated to do its processing.Eric Raymond cites an artificial intelligence (artificial intelligence) application as an example. second example of a demon may be found in personal computer help systems, games, or any application where, when a program so determines by the state of the user interactions with the program, a popup window and program is introduced to the user for help, a clue, or a small calculation.