G'day redss,

There's no need to use fork (or anything like that). The functionality you want is built in. Take a look at Tk::after.

There's a number of ways to use this. From your description, the non-blocking form you'll want in this case will probably be:

$id = $widget->after(ms?,callback?)
[download]

See that documentation for more details. Note the time is in milliseconds. The $id is only needed if you subsequently want to use $id->time(?delay?).