Synchronous programming language. A synchronous programming language is a computer programming language optimized for programming reactive systems. Computer systems can be sorted in three main classes: transformational systems that take some inputs, process them, deliver their outputs, and terminate their execution; a typical example is a compiler; interactive systems that interact continuously with their environment, at their own speed; a typical example is the web; and reactive systems that interact continuously with their env
Open Disk Utility (Applications > Utilities). Select the DVD disc from the list on the left. You will notice that there are two DVD icons--select the one slightly indented (this is the DVD itself, whereas the first one is the drive). Click on New Image in the Disk Utility main window. Choose a name and a destination from the Save As... window. Keep in mind that your destination should have enough space to copy the entire DVD, which can be over four gigs.
1. Insert the original OS X install CD/DVD that came with your computer. 2. Restart the computer while holding down the C key to boot from the CD/DVD. 3. Select Disk Utility from the Utilities menu; repartition and reformat the internal hard drive.Optionally, click on the Security button and set the Zero Data option to one-pass. 4. Install OS X. 5.. Restart the computer while holding down the C key to boot from the CD/DVD. 3. Select Disk Utility from the Utilities menu; repartition and reformat the internal hard drive. Optionally, click on the Security button and set the Zero Data option to one-pass.