String Constants
A string constant is enclosed in double quotation marks ("). Any ASCII character is a valid character in a constant string. A block of text defined with the blockdata instruction can also be a string constant.
Examples of constant strings are:
"Hello" "Klara" "This version of Uniface is very fast"
It is possible to use string substitution features to create string constants that contain the run-time values of fields, variables, and functions.