idlwave-shell-temp-pro-prefix

idlwave-shell-temp-pro-prefix is a variable defined in `idlw-shell.el'.
Its value is

"/tmp/idltemp"

Documentation:
The prefix for temporary IDL files used when compiling regions.
It should be an absolute pathname.
The full temporary file name is obtained by using `make-temp-file'
so that the name will be unique among multiple Emacs processes.

You can customize this variable.