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Useful information about all functions of the system can be retrieved with the help function:
help send USAGE: SEND address message /only /header header-obj DESCRIPTION: Send a message to an address (or block of addresses) SEND is a function value. ARGUMENTS: address -- An address or block of addresses (Type: email block) message -- Text of message. First line is subject. (Type: any) REFINEMENTS: /only -- Send only one message to multiple addresses /header -- Supply your own custom header header-obj -- The header to use (Type: object)
All of this information comes from the definition of the function. Help can be obtained for all types of functions, not just natives or built-in functions. The help function can also be used for user-defined functions. The documentation that is displayed about a function is provided when the function is defined.
You can also search for help on functions that contain various patterns. For instance, at the command prompt, you could type
Help "path" Found these words: clean-path (function) lit-path! (datatype) lit-path? (action) path! (datatype) path-thru (function) path? (action) set-path! (datatype) set-path? (action) split-path (function) to-lit-path (function) to-path (function) to-set-path (function)
to display all the words that contain the string path!.
To view a list of all functions available in REBOL, type what at the command prompt.
what * [value1 value2] ** [number exponent] + [value1 value2] - [value1 value2] / [value1 value2] // [value1 value2] < [value1 value2] <= [value1 value2] <> [value1 value2] = [value1 value2] == [value1 value2] =? [value1 value2] > [value1 value2] >= [value1 value2] ? ['word] ?? ['name] about  abs [value] absolute [value] ...
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