Need explanation about the abstractportal mode

Hai all
can any one explain me why we are using different modes in abstractportal component,what is the purpose ,can u explain with examples?
default CONTENT
when a user is not authenticated LOGON
Hide a portal component. HIDEMODE
Display the error returned by a component. ERROR
Start the component in a test mode. TEST
Preview of the component. PREVIEW
Help text of the component. Development model to provide
help files in the par file.
HELP
Edit and save the profile of a component. EDIT
A short text explaining the purpose of the component. ABOUT
Description Mode

Hi Balaji.
an iView can display (or even not display anything at all - if it hides itself, that's the HIDEMODE) different things or in different states. If it should not be displayed at all, see above. The "normal" content is displayed within the CONTENT mode. If you want to edit the profile of the component (i.e. personalize the iView), this is done within the EDIT mode. If an iView is previewed from within the PCD, this is done within the PREVIEW mode (you may differentiate this mode from the CONTENT mode, as maybe you don't want some things to happen if the iView is previewed without it's page context etc).
Also check out the APIDoc: https://media.sdn.sap.com/javadocs/NW04/SPS15/ep/com/sapportals/portal/prt/pom/NodeMode.html
... as well as some examples, here how the to hide an iView: http://help.sap.com/saphelp_nw2004s/helpdata/en/b7/60b54066ea8531e10000000a1550b0/frameset.htm or how to check the called mode in a test scenario: http://help.sap.com/saphelp_nw2004s/helpdata/en/4d/a7b7424ddcda11e10000000a155106/frameset.htm
Hope it helps
Detlev

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