The virtual-key codes identify various virtual keys. These constants can then be used to refer to the keystroke when using Delphi and Windows API calls or in an OnKeyUp or OnKeyDown event handler. Virtual keys mainly consist of actual keyboard keys, but also include virtual elements such as the three mouse buttons.he virtual-key codes identify various virtual keys. In Delphi, the OnKeyDown and OnKeyUp events provide the lowest level of keyboard response. To use OnKeyDown or OnKeyUp to test for keys the user presses, you must use Virtual key codes to get the key pressed.
What is WorldCat? WorldCat is the world's largest network of library content and services. WorldCat libraries are dedicated to providing access to their resources on the Web, where most people start their search for information. WorldCat.org lets you search the collections of libraries in your community and thousands more around the world.
Tomcat is an open-source project which provides the official reference implementation of the Java Server Pages (JSP) and Java Servlets technologies. In other words, Tomcat serves dynamic web content based on Java technology, and the way it does it is the way it should be done (for Java).Tomcat is just one of many tools in the Apache Software Foundation. Other useful tools are: 1  ant -- a Java-based software-build tool.ou create your JSP code or servlets, write some web pages in HTML to reference them, compile everything, deploy it to Tomcat (which encapsulates it in a container), and test it via a web browser. For general servlet development information, see the Application Developer's Guide.