[R] R function to kill a process

[Gabor Grothendieck]

Is there an R function to kill a process?  I found one in package
fork but it is specific to UNIX and I want something that also
works on Windows.   The XP console command, taskkill,
will do it so I can easily get the effect but it won't work
on other Windows systems, even 2000 and NT.  I found a free utility
pskill.exe by googling around that does work across 2000/NT/XP
but was still wondering about something more general in R.