Hope this is helpful:
>> HELP POKE
Returns value after changing its data at the given index. (See manual)
Arguments:
value -- (series money date time object port tuple)
index -- (number logic)
data -- new value
The list below lists a few of the above pokables as immutable.
(Maybe the list could be broken into two?) -jeff
--------------------------------------------
any-type ; undecidable
any-function ; mutable
action ; mutable (change third ...)
function ; mutable (change first ...)
native ; mutable (change third ...)
op ; mutable (change third ...)
any-word ; undecidable
get-word ; immutable - (an immutable ref. to a mutable word?)
lit-word ; immutable - (an immutable ref. to a mutable word?)
refinement ; immutable - (an immutable ref. to a mutable word?)
set-word ; immutable
word ; mutable (protect/unprotect/set ...)
bitset ; immutable
char ; immutable - scalar
date ; immutable - scalar
error ; immutable
logic ; immutable - scalar
money ; immutable - scalar
none ; immutable - scalar
number ; immutable
integer ; immutable - scalar
decimal ; immutable - scalar
object ; mutable (through set-path ...)
port ; mutable (close ...)
series ; mutable (change ...)
any-block ; mutable (change ...)
block ; mutable - series (change ...)
list ; mutable - series (change ...)
lit-path ; mutable (change ...)
hash ; mutable - series (change ...)
paren ; mutable - series (change ...)
path ; mutable - series (change ...)
set-path ; mutable (change ...)
any-string ; mutable (change ...)
binary ; mutable - series (change ...)
email ; mutable - series (change ...)
file ; mutable - series (change ...)
issue ; mutable - series (change ...)
string ; mutable - series (change ...)
tag ; mutable - series (change ...)
url ; mutable - series (change ...)
symbol ; immutable
time ; immutable - scalar
tuple ; immutable - scalar
unset ; immutable
