Second-level domain name sharing master site cookies login, integration-Asp

For example, there is currently a station: www.abc.com sub-station: 123.abc.com, you want to log on from the primary domain name, or log on from the subdomain can be synchronized, that is, as long as you log on from any station, you can log on from another station.

I have introduced many methods on the internet, and I have tried it. I can't do it because I cannot clear cookies. In the end, I can't do it. I just give up and watch a movie at night: as soon as I looked at it, I thought: How can the death of God arrange for people to die? Then I wanted to share cookies, so there was a way to clear cookies.

The current effect is: you can log on to any site at www.abc.com sub-station: 123.abc.com, and all cookies are common for one site. No matter you exit from any site, all main and sub-sites will be withdrawn

Method:
Add:
Response. Cookies ("mycookies") ("username") = RS ("username ")
Response. Cookies ("mycookies"). Path = "/"
Response. Cookies ("mycookies"). Domain = "abc.com" 'abc. com is added before ."
Response. Cookies ("mycookies"). Secure = false
Response. Cookies ("mycookies"). expires = dateadd ("H", 24, now () 'is not set to your own. You can skip this or

When exiting: Add:

Response. Cookies ("mycookies"). expires = now ()-1
Response. Cookies ("mycookies") ("username") = ""
Response. Cookies ("mycookies"). Path = "/"
Response. Cookies ("mycookies"). Domain = "abc.com"
Response. Cookies ("mycookies"). Secure = false

Note: When logging on to a website, you must note that as long as cookies are modified or updated in that place, you must add:

Response. Cookies ("mycookies"). Path = "/"
Response. Cookies ("mycookies"). Domain = "abc.com"
Response. Cookies ("mycookies"). Secure = false

Another note is that when you exit: If you exit the sub-domain name, you must add a logout. asp exit file to each site.
I have not tried cross-domain names. I don't know if it works.