starting churned http listeners iis controlling c#.net 2.0

i have twin windows services controlling same machine. both services uses

private httplistener listener;

i mention baseurl "" & "" respectively any services. following i needed call

listener.start();

the initial use starts successfully during 8080 port. nonetheless i start 2nd service,
i httplistenerexception "the slight can't opening record since being used another process" listener object.

could anybody greatfully tell me:
1) illusory start twin http listeners same iis during twin opposite ports.
2) yes, achecive this?
3) there any proceed doing this?

for your information:
i am controlling c#.net 2.0 iis 6.0 server.

thanks & regards,

hari