The microcontroller's instructions are stored internally in the Flash or on external EEPROMs and, the controller must fetch these commands to initialize the internal hardware to a well know state. Then, start executing your code.
That's why I think that instructions can't be transmitted wirelessly.
The question is rather not clear. If you are asking to communicate to and from a microcontroller to achive some functions wirelessly, it can be easily done by interfacing the microcontroller with TLP433 RF modules or even Zigbee is a popular choice today for wireless communications.
Cheers
tahnks.. I want to know that how can I send instructions from microcontroller to a digital camera through wireless medium and further recieve an image from digital camera. is there any card or module which can recieve the analogue input from a camera and convert it into digital output and further send this image to microcontroller..
digital camera......card......transmitter........receiver......card.....microcontroller......