They make up the cardiac pacemaker, that is, the natural pacemaker of the heart. In most humans, the concentration of pacemaker cells in the sinoatrial (SA) node is the natural pacemaker, and the resultant rhythm is a sinus rhythm. Sometimes an ectopic pacemaker sets the pace, if the SA node is damaged or if the electrical conduction system of the heart has problems.
Lobo is an extensible all-Java web browser and RIA platform. It supports HTML 4, Javascript (AJAX) and CSS 2 plus direct JavaFX and Java (Swing/AWT) rendering. Cobra is the web browser's renderer API; also a Javascript-aware HTML parser.
Set which web browsers should use Java. Select which browser installation(s) on your computer should use the latest Java version you installed. Click the Start button on your computer, and click All Programs (on Windows 7) or All apps (on Windows 10). Find Java in the list of programs (which may also say Java (32-bit) or Java (64-bit)).