PATH env. variable value if Oracle is installed

Hi,
When Oracle is installed on the machine,in such case if we type on command prompt "PATH" and enter (on Windows machine) then we see the first value pointing to the ORACLE INSTALLED directory.I want to know, does this value persist till we uninstall Oracle from machine?
What will happen if 2 applications want to share the same path, one application wants to chage the path value which will update ORACLE INSTALLED directory,and other one wants to keep it as it was earlier ?
Waiting for reply.
Thanks,
Rupesh

Agreed ! What I want to confirm is that the first value in PATH env. variable.
Does it remain same always ?
Like, if I type PATH on command line and press ENTER, I can see value of PATH variable as :
D:\ORACLE\BIN;C:\PRO\BIN;D:\ABC\BIN;....; and so on.
First value in above string is always ORACLE_HOME\bin directory. So, does it mean that, if Oracle is installed on machine, then PATH variable always sets it first place to search to ORACLE_HOME/bin directory ? is it so ? please suggest me.
Thanks,
Rupesh

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