Sessions

Associated Tags

If a visitor's browser does not return a previously set session, then start a new session
sessionstart = [sessionstart life=1200]  < starts a 20 min (60 seconds x 20 minutes) session
session = [session]

Now send the [session] value back to the visitor in a POST form:
<input type="hidden" name="session" value="[session]">
or in a url:
mypage.dna?session=[session]

When the visitor clicks through to mypage.dna, check for the session:
session = [session]
sessionalive = [sessionalive]
sessionlife = [sessionlife]
sessionIPmatch = [sessionIPmatch]
browserIDmatch = [browserIDmatch]
sessionip = [sessionip]
sessiondate = [sessiondate]
sessiontime = [sessiontime]
sessionutime = [sessionutime]

[sessionlife] will indicate how much longer the session has until it expires,
this is useful if a user is limited to the amount of time spent on a page or a website, 
or if the need to record how long that user has spent on the site.

A simple use:
[if ("[sessionalive]"="T")]
   [then]  OK  [/then]
   [else]  redirect out of secure area  [/else]
[/if]copy

HINT:
The page that RECEIVES the session MUST include the [session] tag, if it is being passed as a variable named "session" WebDNA will recognise the variable and use the value, however if the session value is being passed with a different name such as "CheckUser" then that variable needs to be converted to "session" on the receiving page, simply turn it into a text variable as such:
[text]session=[CheckUser][/text], now WebDNA can use the value to do further calculations on the session such as the ones above in the example.

ADVANTAGES:
Works with search engines
Security is increased by not allowing a cookie to be manipulated
Easier to use and much faster than a client-side cookie
Good for visitors who do not want to leave information behind them (cookie disabled)
Allows to easily kill a session
Allows to move a session from one browser to another browser

In certain rare cases, it is possible to find two identical browser "fingerprints" or BrowserID. It is not advised to do visitor recognition based only on Browser ID

[sessionstart life=1200]
starts a 20 min (60 seconds x 20 minutes) session
[sessionstart] without any specification has an unlimited lifetimecopy

USAGE:
Follow the visitor by moving the [session] value from one page to the other with a POST or GET
Identify a visitor who logged-in : associates the tag [session] with the user name
Identify a visitor who comes back after a period of time. Depending on the settings, testing the session will enable recognition of the visitor.

In certain rare cases, it is possible to find two identical browser "fingerprints" or BrowserID. It is not advised to do visitor recognition based only on Browser ID

[sessionip]copy