Tries to cancel a task.
opal.task_cancel(opal, id)
Opal object.
Task identifier.
Other task functions:
opal.task_wait()
,
opal.tasks()
,
opal.task()
if (FALSE) {
o <- opal.login('administrator','password', url='https://opal-demo.obiba.org')
opal.task_cancel(o, '1')
opal.logout(o)
}