Portals
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Liferay
portal-ext.properties file is one whose changes reflect to each portlet in whole protal framework. To the extent I know, most of the Liferay portlets are instanceable, except a fews like- alerts and announcements portlets. The reason behind it is some portlets have specifically being made to be 'system portlets' by functional requirement and not due to the need to restrict their availability/instancability. Back to your question, I think there is no such property to set all portlets instanceable. So if you need to set all portlets instanceable, then you have to customize existing portlets or if you need some related features, there are probably other instanceable portlets which would have the functionality what you need.
How to set multiple portal instance in portal-ext.properties - Forums - Liferay.com
Page Rendering - Wiki - Liferay.com
Pages are rendered via the following mechanism: Request comes in through MainServlet. Various attributes are stored in the session and request.
The last major step to implementing permission to your custom portlet is to check permission. This may be done in a couple of places. For example, your business layer should check for permission before deleting a resource, or your user interface should hide a button that adds a model (e.g., a calendar event) if the user does not have permission to do so. Checking Portlet Resource Permission Similar to the other steps, the default permissions for the portlet resources are automatically checked for you.
Chapter 5. Liferay Services
We are getting close to going from our demo Liferay intranet to the production version, but I have received a request from several people that actually surprised me. They feel overwhelmed with the amount of options available under The Add button on the dockbar. Personally, I don't get it. But what they want is for me to "remove" those items from the "Add More" area so that there are only a few options of portlets to add. So, is there a way of doing this without removing the actual portlets?
Can I "hide" portlets without removing them from the server? - Forums - Liferay.com
IPC
Chapter 6. Multiple Portal Instances
Chapter 6. Multiple Portal Instances Liferay was built from the ground up to be used by application service providers. By installing multiple portal instances a complate isolation of the users, organizations, locations, communities and any other data created through Liferay's portlets is achieved.
Version 2.0 of the Portlet Specification plans to align with J2EE 1.4, integrate other new JSRs relevant for the portlet, and align with the WSRP specification V 2.0. This JSR requests the creation of the next version of the Portlet Specification. The main goal of this version is to align the Java Portlet Specification with J2EE 1.4, other JSRs relevant for portlet programming, like JSR 188, the next version of Web Services for Remote Portlets (WSRP) 2.3 The Executive Committees would like to ensure JSR submitters think about how their proposed technology relates to all of the Java platform editions.
The Java Community Process(SM) Program - JSRs: Java Specification Requests - detail JSR# 286
To enable interoperability between Portlets and Portals, this specification will define a set of APIs for Portal computing addressing the areas of aggregation, personalization, presentation and security. 3.1 Please list any existing documents, specifications, or implementations that describe the technology. Please include links to the documents if they are publicly available.
The Java Community Process(SM) Program - JSRs: Java Specification Requests - detail JSR# 168