... Introduction1
Financial support from the Deutsche Forschungsgemeinschaft through SFB 504 is gratefully acknowledged. 
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... 2
University of Mannheim, SFB 504, L 13, 15, D-68131 Mannheim, email oliver@kirchkamp.de 
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... signals2.1
Standard signals are HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM CHLD CONT STOP TSTP ttIN ttOU URG XCPU XFSZ VTALRM PROF WINCH POLL PWR. 
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