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+Invoke a function.
+
+Functions are loaded to the server with the `FUNCTION LOAD` command.
+The first argument is the name of a loaded function.
+
+The second argument is the number of input key name arguments, followed by all the keys accessed by the function.
+In Lua, these names of input keys are available to the function as a table that is the callback's first argument.
+
+**Important:**
+To ensure the correct execution of functions, both in standalone and clustered deployments, all names of keys that a function accesses must be explicitly provided as input key arguments.
+The function **should only** access keys whose names are given as input arguments.
+Functions **should never** access keys with programmatically-generated names or based on the contents of data structures stored in the database.
+
+Any additional input argument **should not** represent names of keys.
+These are regular arguments and are passed in a Lua table as the callback's second argument.
+
+For more information please refer to the [Redis Programmability](/topics/programmability) and [Introduction to Redis Functions](/topics/functions-intro) pages.
+
+@examples
+
+The following example will create a library named `mylib` with a single function, `myfunc`, that returns the first argument it gets.
+
+```
+redis> FUNCTION LOAD "#!lua name=mylib \n redis.register_function('myfunc', function(keys, args) return args[1] end)"
+"mylib"
+redis> FCALL myfunc 0 hello
+"hello"
+```