Creates an alias that can be used in the shift to screen of a control. This is very useful for specifying a return screen that depends on the history of how the screen was arrived at. Consider for example the three screens:
:SCREEN SCENARIO
COMMAND,"",0,0,0,0,,,SPECIAL>ALIASSCREEN|SETUP|SCENARIO
BUTTON,"Help",50,50,0,0,,,,HELP
:SCREEN GAME
COMMAND,"",0,0,0,0,,,SPECIAL>ALIASSCREEN|SETUP|HELP
BUTTON,"Help",50,50,0,0,,,,HELP
:SCREEN HELP
BUTTON,"Return to Setup",50,50,0,0,,,,SETUP
In this case pressing the "Return to Setup" button will return you to the screen you came from. You can use ALIASSCREEN as many times as you like. Each use of ALIASSCREEN with the same aliasname will simply replace the old value.
If you specify a value for screenname that does not exist an error will be issued when you attempt to shift to aliasscreen.
