Interesting question in reference to texting, emails or phone call.
(Temporary Ohel) [Part 1] Understanding why a overhead shelter held up by a person is not a problem;
A Fly in a Big or Small Box. A Fly in a Closet: Is It Okay to Close the Door?;
How to Deal With Putting Items Into the Refrigerator, for Example Sodas, That One Will Need for מוצאי שבת (Motzei Shabbos);