How can I use environment variables in a controller?

Hi all,
How can I use environment variables in a controller?
I want to pass a fully qualified directory and file name to FileInputStream and would like to do it by resolving an env variable, such as $APPLTMP.
Is there a method somewhere that would resolve this??
By the way,Did anyone used the class of "oracle.apps.fnd.cp.request.RemoteFile"?
The following is the code.
My EBS server is installed with 2 nodes(one for current,and other is for application and DB).I want to copy the current server's file to the application server's $APPLTMP directory. But the result of "mCtx.getEnvStore().getEnv("APPLTMP")" is current server's $APPLTMP directory.
Can anyone help me on this?
private String getURL()
throws IOException
File locC = null;
File remC = new File(mPath);
String lurl = null;
CpUtil lUtil = new CpUtil();
String exten;
Connection lConn = mCtx.getJDBCConnection();
ErrorStack lES = mCtx.getErrorStack();
LogFile lLF = mCtx.getLogFile();
String gwyuid = mCtx.getEnvStore().getEnv("GWYUID");
String tmpDir = mCtx.getEnvStore().getEnv("APPLTMP");
String twoTask = mCtx.getEnvStore().getEnv("TWO_TASK");
// create temp file
mLPath = lUtil.createTempFile("OF", exten, tmpDir);
lUtil.logTempFile(mLPath, mLNode, mCtx);
Thanks,
binghao

However within OAF on the application it doesn't.
what doesnt work, do you get errors or nothing ?XX_TOP is defined in adovars.env only. Anywhere else this has to go?
No, it is read from the adovars.env file only.Thanks
Tapash

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