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Windows does not support the SIGALRM flag.

Python 2.2.1 (#34, Apr  9 2002, 19:34:33) [MSC 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license" for more information.
IDLE 0.8 -- press F1 for help
>>> import signal
>>> dir(signal)
['NSIG', 'SIGABRT', 'SIGBREAK', 'SIGFPE', 'SIGILL',
'SIGINT', 'SIGSEGV', 'SIGTERM', 'SIG_DFL', 'SIG_IGN',
'__doc__', '__name__', 'default_int_handler', 'getsignal',
'signal']
>>> 

I believe you will need windows specific code to accomplish
this on Windows, possibly requiring Mark Hammond's win32
modules.

I personally am only running RoundUP on Linux at this time,
but I know you are striving for cross platform compatibility.