MaxL command to update variable

Hi Essbase gurus

We currently have maxl scripts that automatically update date variables for our cubes. Currently they are set up with the following syntax:

alter application 'appname' set variable 'variable' xyz;

In EAS, there is an option to set global type variables by having (all apps) as the value under Application, and (all dbs) as the value under Database. Is there a way that I can alter my above statement to change the substitution variable for (all apps) instead of specific applications?

Thanks in advance for any insight - I couldn't find any example or documentation online.