The Class Browser in Visual FoxPro 3.0 is written in FoxPro and is specified by a system variable named _BROWSER which defaults to _BROWSER=SYS(2004)+"BROWSER.APP". The Class Browser opens a single or multiple visual class libraries (VCXs) and is a modeless application. The Class Browser is launched by selecting Browser from the FoxPro system menu which executes the program defined in a system variable called _BROWSER. The Class Browser supports both visual and non-visual (Custom) classes. Multiple instances of the Class Browser may be launched. Selecting Browser from the FoxPro system menu always launches a new instance while the Window menu list is used to activate an existing instance.