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Java applets are classes written in Java which are intended not to run as stand-alone programs (as applications do) but as subprograms of a browser which is already managing a window.
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Applets should NOT have main method but rather methods called init, start, paint etc. for displaying on the browser window
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Applets are not trusted as a default, so they have several restricitions on running on the client machine
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no printing or file I/O
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cannot connect through the network to any machine but its own server
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any new windows created by the applet have a warning label
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One can sign Applets (that is what Tango does) to allow user to give permission for such services
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