Question

The do function in rebol seems to accept unlimited arguments. Can I do that with my own function (without using a block of arguments) ?

Answer 1

It is not possible to define a function with a variable number of arguments. The last message in this Rebol Mailing List thread http://www.rebol.org/ml-display-thread.r?m=rmlDTXB has an explanation.

Also the do function takes a single argument:

>> ? do
USAGE:
    DO value /args arg /next 

DESCRIPTION:
     Evaluates a block, file, URL, function, word, or any other value.
     DO is a native value.

ARGUMENTS:
     value -- Normally a file name, URL, or block (Type: any)

REFINEMENTS:
     /args -- If value is a script, this will set its system/script/args
         arg -- Args passed to a script. Normally a string. (Type: any)
     /next -- Do next expression only.  Return block with result and new position.