On Wed, 21 Jan 2015, Lucio Chiappetti wrote:

2) I want to keep the current date on the screen (and time as well, but
   time is no problem)


   Is there a smart way to have a button periodically refresh its
   content ?

thanks to the previous hint to SendToModule ... ChangeButton my solution is to run via crontab at midnight the following two line shell script

set a = `date "+%a %b %d"`
/usr/bin/FvwmCommand "SendToModule MyBox ChangeButton myDate Title '$a[1] $a[2] $a[3]'"


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