Functions execute statements or print HTML. There are 3 kinds of Vortex functions: script functions written in the script; user functions, linked into Vortex and extensible by a C programmer; and builtin functions, also linked into Vortex. Functions are called by giving the name in a tag, possibly followed by arguments as attributes:


When the function ends, script execution resumes at the statement following the call.

The function main, which must be defined in all Vortex scripts, is the default start function of the script: execution begins with a call to it. (A different start function can alternatively be given in the URL; see here.)

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