The ability to hide an application is particularly useful for applications that you don't frequently need to interact with, such as the OSXvnc server. The Hide option, found in the application menu of most Mac OS X applications (for example, OSXvnc Hide OSXvnc), can usually be invoked with the -H keyboard shortcut to hide the currently running application.
To un-hide the application, simply click on the application's Dock icon or use the application switcher ( -Tab) to locate the application. The Hide Others menu selection (sometimes available with the keyboard shortcut Option- -H) hides all other open applications.
Finally, the Show All menu option, which is located in the application menu, brings all running applications out of hiding.