best method for RT communication

Hi all ,

I am using RT OS for my project , connected with the host PC , both the places I am creating the global variable of same names , like for DMM i create 2 global variable one in host and one is RT .I am passing the infor from host one after the other .I am processing the command in RT and the data is sent back to the host .

for displaing and reporting .

can any one tell me is ther any other best method to communicate between host and RT communincation other than the global variable , or can one tell me that this is the best method .

Regards,