The |GETCHAR command reads the code for a character at position x,y in window n.
To see an example of this command in action, type:<br/>RUN"RSXLIST4"<br/><gallery widths="384px" heights="270px" perrow="2">image:getchar1.pngimage:getchar2.png</gallery>
The z80 assembler code for the |GETCHAR command, provided here for completeness.