The ?! command is used in the BASIC/FlashBASIC
debugger to display the current call stack with current parameter
values being shown.
Note: This command can only be used on items compiled with
the o (optimal compile) option.
Syntax
{flash.routine.name:}?!
Note: flash.routine.name can only be
specified if the program has been optimized through the FlashBASIC
compiler. When flash.routine.name is specified,
the corresponding debugger command is executed
against the specified routine. The colon separating flash.routine.name and the debugger command is required.