Install CRS so ASM can share diskgroups accross instances

I saw a note in a 10.1 document that mentions CRS can be used to allow ASM instances to share disk groups and that this configuration does not require a RAC license if single instance databases are being used.
We have a scenario in our development and test environments where clustered databases are not required but I would like to set up ASM similiar to production for consistency purposes.
Is anyone familiar with this? Is there any difference between this type of CRS install and one for RAC databases?

OK so you start off pretend that you are going to install RAC.
You install the clusterware onto your nodes
Then you install ASM onto your nodes
and create network listeners and ASM instances / diskgroup(s)
Then - you do not install the RAC database
instead you may wish to install a new database home that has RAC linked off and then use dbca to create single instance databases - you put the datafiles on asm by specifying something like +DATA (for the DATA) diskgroup                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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    Hi,
    user5448593 wrote:
    I'm fairly new to RAC/ASM and haven't performed any patch set upgrades yet. Back in the simple days when I wanted to apply a patch set to a database, say from 10.2.0.4 to 10.2.0.5, I would create a brand new Oracle home ahead of time and apply the patch set to it.
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    Starting with 11.2 for Grid Infrastructure only "out-of-place" patchset upgrades are supported.
    >
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