The Alt and Ctrl keys have dual modes. They can be mapped
to a function by themselves or they can be used in combination with
other keys.
For example, to map the 3270 function Print Screen
to Ctrl+P:
In the Functions list, select Print
Screen.
Click New.
Click the right Ctrl image twice.
In the Key Mappings list, the first
time you click the right Ctrl image, it displays as Right
Ctrl. The second time you click the image, it changes
to Ctrl+.