Both the ALT and CTRL keys have a dual modes. They can be mapped to a function by themselves or they can be used in combination
with other keys.
For example, if you want to map the 3270 function "Print Screen" to CTRL+P, click the right CTRL key which displays as: Right
Ctrl. Then click the right CTRL key again and it changes to Ctrl+ , then click the P key which results in Ctrl+P.