gawk only execute Win NT command once

[Albert Kwok]

Hi, I am trying to run a awk program under Windows NT that execute a NT batch
program. It seems to only work the first time I run it and it seems to skip the
system call after. I have reproduced the problem with the following program:
gawk "{ \"echo\"|getline line; print line; }"

I am running GNU Awk 3.0.4 version. Could you tell me if this version support 
Win
NT or what do I have to do to get it running properly under NT?

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Thanks very much in advance.
Albert