shutdown postmaster question

i use the following commands to start the postmaster
on my development winxp / cygwin / pgsql 7.4.5
setup...

1.

/usr/sbin/cygserver &

2.

postmaster -i -D /usr/share/postgresql/data &

before getting to my real question, what do the "&"
characters do?

now to the real question... how do i shut down the
postmaster? i checked the docs bu it wasn't clear. i
tried their example and it didn't work.

i read about the signals... SIGTERM, SIGINT, or
SIGQUIT, but i don't how to implement them since the
example given didn't work. any help woul dbe greatly
appreciated.

i have been shutting down cygwin to end pgsql, but my
guess is that isn't the best way to shut it down.

tia...

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