program

[Altera_Forum]

In DE2 board, how to send control signal into the FPGA and receive data 

from the FPGA by a program?

[Altera_Forum]

From FPGA to ? and from ? to FPGA. !!!!

[Altera_Forum]

In DE2 board, how to use a program on PC to send control signal from the program to the FPGA and receive data from the FPGA to the program?

[Altera_Forum]

Basically, you can use any of the DE2 provided PC compatible interfaces (Ethernet, USB device, RS232) to do so. Also JTAG through on-board USB Blaster would be an option, but it misses a documented interface at the PC side. 

 There are some demonstrations dealing with the PC interfaces, I think. To answer a possible follow-up question in advance: I'm not using the DE2 Dev Kit and don't have any ready to use examples of PC communication. Other forum members may have.