Renaming Oracle_HOME of Oracle 816 on Solaris 2.7

Gurus,
Could someone out there help me with following questions,

Oracle: 8.1.6 ( Patch 8162 applied to it) OS: Solaris 2.7

1. Can we ( How can ?) rename ORACLE_HOME of Oracle 8.1.6 on solaris, with out re-installing :-)
   ( Currently my oracle_home is located at /opt/..../8162 wanted to rename to
   /opt/.../816)
2. How can we get the COMPLETE list of installed products on 816, without running the slow sluggish Installer from my client. Just by looking into a file or running a command from unix side..

I know short(summary) list of products are recorded in $ORACLE_HOME/install/unix.rgs, but wanted to know complete list of products. !!

( even querying product_component_version is also of not much use in my
case, need COMPLETE list)

'inspdver' is not available for Oracle 8i and above (correct me?)

Thanks in advance,
Siva

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