You can start a brand new input script from the current one.
However, keep in mind that GuiXT will not return control to the
original input script after the new one has finished.
let's say you have two input script A.txt and B.txt
Contents of A.txt
Enter "/nmm01" "process=B.txt"
The following portion of the script will never get executed if
Screen ABC is processed
GuiXT executes A.txt and it processes screen ABC, it will
execute function mm01 and start with a new input script called
B.txt. The control does not return to A.txt again