Can't remember the SGML entity name for a character you want to insert? It doesn't matter with Screem as the correct entity can be inserted when you press the character. There are some special exceptions to this, such as for , , and which requires you to enter the then press the character.
If you aren't using the ISO-8859-1 character set then you may not actually want the entity insertion. In that case you can turn the feature off, or have it enabled on a character set basis.