As we know RPi A+ has only on usb slot.

and to connect all these (keyboard, mouse, wifi adapter) devices i will need a USB hub, by default most people needs wifi and keyboard at least.

so the question is, may i configure the keyboards usb transpmitter to accept wifi signals? or i need to use them separately?

PS: i dont want to believe that the developers forgot about this case

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    I am not sure what you are asking, but some usb keyboards do come with a usb hub built in so you could add a usb wifi adaptor to a usb keyboard that hosted its own usb hub. I would worry about power. Your best bet is to attached a powered USB hub and connect everything to that. – rob Nov 28 '14 at 16:08
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    i dont want to believe that the developers forgot -> I am sure it is on purpose, lol. If this is a major issue for you, it's you that forgot when you decided to buy a board with only one jack. I would buy a model A right now if they came with onboard ethernet. Since they clearly do not, I am left having to choose something else (such as the rpi B). – goldilocks Nov 28 '14 at 18:20

Wireless keyboards could operate by using radio frequency (RF) or infrared (IR). RF techniques range from 27 MHz to up to 2.4 GHz (according to wikipedia). With Bluetooth being a widely used technology. While both WiFi and Bluetooth share the 2.4 GHz band they differ both in technical aspects as well as in their objective.

So in short: Your (presumed) Bluetooth dongle of the wireless keyboard is not going to double as an WiFi dongle.

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The simplest method to solve this problem is to use an USB hub. USB rf transmitter is not suitable for transferring WiFi. While technically it could, you'd probably have to upload custom firmware to it, which is nearly impossible to a normal user.

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