The value n is the name of a subdirectory in which to store temporary files for Caché. The string can be a relative pathname which would be created under the Caché manager directory, or a full directory specification.
The default value, Temp, identifies the following location under install-dir, the Caché installation directory:
When you set a new TempDirectory value, the system creates a subdirectory of this name under the Mgr subdirectory in the Caché installation directory, as shown for Temp in the previous example. This new directory becomes the Caché temporary directory.
To create c:\intersystems\cache\mgr\temp\ on windows
The default string is Temp
On the page System Administration > Configuration > Additional Settings > Startup, in the TempDirectory row, select Edit. Enter a subdirectory name.