How many TOP are in APPS and what they mean........

Dear All
One very basic question, how many TOPs are there in APPS, middle tier and db tier, and what does they mean, like we have APPL_TOP, COMMON_TOP, etc.......
regards

how many TOPs are there in APPSNo specific answer since it differs from release to release. Oracle Apps 11i installation comes with many TOPs defined (e.g. APPL_TOP, COMMON_TOP, FND_TOP, AU_TOP, ..etc).
and what does they mean, like we have APPL_TOP, COMMON_TOP, etcSimply, they are environment variables.
Let us say ..
You have installed the APPL_TOP under /u01/oracle (e.g. /u01/oracle/prodappl)
and,
I have installed it under /u02/oracle (e.g. /u02/oracle/prodappl).
When we both issue "echo $APPL_TOP":
You would get:
$ echo $APPL_TOP -- On Windows, type %APPL_TOP%
/u01/oracle/prodapplAnd, I would get:
$ echo $APPL_TOP -- On Windows, type %APPL_TOP%
/u02/oracle/prodappl

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How many TOP are in APPS and what they mean........

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