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Cannot get ^Z to suspend a program

I am using cygwin under windows xp pro and under windows 2000 pro, and
cannot get the ^Z to suspend a program that I have opened.  note that I
normally use tcsh, but I also experience the same problem using bash...

^C will kill the program without any problem

if I type & after a program name, then it is also successful in putting the
program into the background

I have tried the following to diagnose the problem, but have been

if I type stty -a I get:
speed 38400 baud; rows 33; columns 90; line = 0;
intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = <undef>; eol2 =
start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush
= ^O;
min = 1; time = 0;
-parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk brkint ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
-ixany imaxbel
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0
isig icanon iexten echo echoe echok -echonl -noflsh -tostop echoctl echoke

the following in the output of the 'bindkey' command:
"^Z"           ->  tty-sigtsusp

I have tried setting the environment variable CYGWIN to tty and also "tty",
but that doesn't seem to do anything

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