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This work:
'------------------------------------------------------------------------------------
memclear
cls
button "Quit",[endprog]
timercb 1000,[endtest] 'run for a second
'timercb 0 before 1000ms
wait

[endtest]
wprint "<br>timer triggered"
return

[endprog]
timercb 0 ' stop timercb on endprog
end
'------------------------------------------------------------------------------------