Arduino UNO interface with Atmega

Hello,
I need to know is there any possibility to interface Arduino Boards with any of the Atmel controllers ? I am working on Atmel series micro controllers like Atmega 16,32,128. Now i need to interface my Atmel development board with Arduino UNO board . . Can any one please help in this regard

What do you mean by "interface with"?

I mean Arduino board interfacing with any other micro controllers

Sure - via Serial Rx/Tx, I2C, SPI, simple signals - just drive a pin high or low to let the other side know something occurred, software serial, etc.