Returns descriptions of the various built-in functions available on the server. If <name> is provided, only the description of the function with that name is returned. If <name> is omitted, a list of descriptions is returned, one for each function available on the server. E_INVARG is raised if <name> is provided but no function with that name is available on the server.
Each function description is a list of the following form:
{<name>, <min-args>, <max-args>, <types>}
where <name> is the name of the built-in function, <min-args> is the minimum number of arguments that must be to the function, <max-args> is the maximum number of arguments that can be provided to the function or -1 if there is no maximum, and <types> is a list of <max-args> integers (or <min-args> if <max-args> is -1), each of which represents the type of argument required in the corresponding position. Each type number is as would be returned from the `typeof()' built-in function except that -1 indicates that any type of value is acceptable and -2 indicates that either integers or floating-point numbers may be given. For example, here are several entries from the list:
`Listdelete()' takes exactly 2 arguments, of which the first must be a list (LIST == 4) and the second must be an integer (INT == 0). `Suspend()' has one optional argument that, if provided, must be an integer. `Server_log()' has one required argument that must be a string (STR == 2) and one optional argument that, if provided, may be of any type. `Max()' requires at least one argument but can take any number above that, and the first argument must be either an integer or a floating-point number; the type(s) required for any other arguments can't be determined from this description. Finally, `tostr()' takes any number of arguments at all, but it can't be determined from this description which argument types would be acceptable in which positions.