non-essential

non-essential is a variable defined in `simple.el'.
Its value is

nil

Documentation:
Whether the currently executing code is performing an essential task.
This variable should be non-nil only when running code which should not
disturb the user. E.g. it can be used to prevent Tramp from prompting the
user for a password when we are simply scanning a set of files in the
background or displaying possible completions before the user even asked
for it.