Provide ability to message another user without having to assign a patient
Take a look at the Office Notes instead of Patient Notes. Miscellaneous->Ofc Notes
Some rules on searching patient records:
"If the search string begins with a lower case letter, names containing the search string anywhere in the last name will be returned. If the string starts with a capital letter, last names which begin with the search string will be returned. To search for a string in a first name, use the rules described so far, but
place a comma before the search string"
Refer to IPPF guide, I think its path is something close to "Openemr/documentation/IPPF_Guides/Finding an existing OpenEMR Record.pdf" For further details on this and check out other files in the same folder for more on OEMR..