Call DOS-based exe file

Hi,
I have a DOS-based EXE file. When run it at DOS command window, it needs input 2 parameters at two rows respectively.
Now I want to call this exe file in Labview, How do I do?
I tried System Exec.vi, but I dont know how to pass the two parameters in the "stand input".
Detailed, my dos-base exe file runs at DOS command window like this:
c:abc.exe (click carriage return)
Input parm 1: a1
Input parm 2: a2
In the "command line" of the System Exec.vi, I can put "abc.exe", but how I can put the two input parameters "a1" and a2 at the standard input.
Thanks.
RED

Thanks for your reply. But I still can not pass the two parameters in "command line" of System Exec.vi. For example, in the command line I put "abc.exe a1, a2", the DOS window was opened, still prompting me input a1, a2. Then another strange thing happened, when I input a1, a2, the DOS exe file seems not execute and quickly returns to Labview panel.
Do you know what should I do?
Thanks

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