using 2 diffrent clock rates in a design.

[Abs]

Hi friends.
how r u all doing,
well i have a doubt here. i have to write a tcl script to produce an
input from a file at a clock rate "clk1" and then capture the output of
the DUT at a diffrent clock rate say "clk2". now i have to give input
to DUT at a while loop and then capture at a diffrent loop. i'am facing
problem here/
any clues or ideas how to proceed..
plzz reply soon..

thanks

bye