local function idToLabel(id)
local computerid = {0, 1, 2} --add more id's here as needed
local label = {"computer 0's label", "computer 1's label", "computer 2's label"} --change these to match, make sure entry 0 is matches 0 above
local found = 0
    for n = 0,#computerid do --starting a for loop to check the above array entires from 0 to the number of entries in computerid (#computerid)
        if computerid[n] == id then --when there's a match continue
            name = label[n] --set variable "name" to the value of the matching label
            found = 1 -- placeholder variable to bypass a nil exception
            return name --return the variable name to where it was called from
        end
    end
    if found = 0 then --if no id and matching label are found
        return false    -- function returns false value
    end
end

rednet.open("top")
while true do
    id, text = rednet.receive() --simplified, if () has no number the listener stays open
    idtolabel(id)
    if not idtolabel then   --this line will check if idtolabel returned false
    print(id .. "> " .. text)  --if false instead of using "name" which would be nil, display the id instead
    else                        --otherwise
    print(name .. "> " .. text) --use the name variable rather than the computer id
end