The system variable ⎕LX contains a text expression to be executed when the workspace is loaded. When the workspace is loaded, the execute function is used to execute ⎕LX, and so ⎕LX can be used to invoke a function, print some text, or execute a multi-statement line.
⎕LX←'START' Runs START
⎕LX←''' TEXT STRING''' Prints TEXT STRING
⎕LX←''' TEXT STRING'' ⋄ START' Does both