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Update rednet_guide.md

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doc/guides/rednet_guide.md
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@ -46,12 +46,19 @@ Before using Rednet, your program needs to open it. Opening Rednet will tell the
modem to start listening for messages from other computers. The modem to start listening for messages from other computers. The
[`rednet.open`](https://tweaked.cc/module/rednet.html#v:open) function takes the [`rednet.open`](https://tweaked.cc/module/rednet.html#v:open) function takes the
side of the modem to open as a string. On pocket computers, this will always be side of the modem to open as a string. On pocket computers, this will always be
`back`. For example, if your modem is on the left side, you would use this code: `back`. For example, if your modem is on the left side of the computer, you
would use this code:
```lua ```lua
rednet.open("left") rednet.open("left")
``` ```
You can also use this code to open every attached modem at once:
```lua
peripheral.find("modem", rednet.open) -- (Ab)uses peripheral.find's filter parameter to run rednet.open for each modem found.
```
Always run this function before you do anything with Rednet - otherwise, it may Always run this function before you do anything with Rednet - otherwise, it may
not function as expected. not function as expected.