idlwave-scan-all-buffers-for-routine-info

idlwave-scan-all-buffers-for-routine-info is a variable defined in `idlwave.el'.
Its value is

t

Documentation:
Non-nil means, scan buffers for IDL programs when updating info.
The scanning is done by the command `idlwave-update-routine-info'.
The following values are allowed:

nil Don't scan any buffers.
t Scan all `idlwave-mode' buffers in the current editing session.
current Scan only the current buffer, but no other buffers.

You can customize this variable.