Control a computer with another computer

So I mainly want to control a monitor from a distance away but I'll probably need another computer. In other words using modems or something I want to have a computer that controls a computer that controls a monitor. Oh Also I'm in tekkit classic (1.2.5)

As of now, there is no way to send information directly to a monitor, so really what you will need is a computer controlling a computer controlling a computer controlling a modem.
Just as a base, I wrote you up a little program that will ask for an input and send it to another computer which will send it to another computer which will print it on a monitor.
Untested code:
Computer 1:

rednet.open("top") -- Opens a modem on the top of the computer
local input = read() --Ask for a user input
rednet.send(1, input) --Replace 1 with the 2nd computers ID

Second computer:

rednet.open("top")
id,message = rednet.receive() -- Waits for a message
rednet.send(2, message) --Replace 2 with the final computers ID

Final computer:

rednet.open("top")
id,message = rednet.receive()
mon = peripheral.wrap("back") -- Replace back with whatever side the monitor is on
mon.write(message)

Awesome thanks. I'm still learning computercraft. I've never used rednet before. I'll test it when I get back

You don't need three computers, two will do just fine.

Alrighty then what would I have to do differently?

It doesn't seem to send to computer number 2. I am only using 2. Only real difference I see is when you turn on computer 1, and then type something the first time it doesn't do anything.

Lyqyd, I was implying that if the computers were too far away from each other computer number 1 would not be able to reach the monitor computer.
And to WhitePhoenix0, for only two, you would have to use the code from computer 1 and 3, not 1 and 2. Also, if the computers are too far away (16 blocks default I think.) They cannot receive messages. Also, remember to replace the ID's in my code with the ID's of the new computers.

So that line I though did nothing, is what appears on the monitor. It only displays the text though, it doesn't run the program. Also it only works once.

For it to work multiple time at the beggining of all of them put

while true do

Which will make an infinite loop.
What do you mean by run a program? What exactly do you want from this? Tell me what the program is.

Like if I type worm nothing happens. I know you can't play it with the monitor but still… well I want to be able to do something other print text

If you want your monitor to mirror your computer, it is way more complicated use this:
http://www.computercraft.info/forums2/index.php?/topic/15873-mirror-utility-program-contents-of-computer-screen-on-monitor-v1/