## Not run:
# ## These cannot be run by examples() but should be OK when pasted
# ## into an interactive R session with the tcltk package loaded
#
# ## Run just once, after 1 sec
# test <- function () cat("==== Hello from Tcl! ====\n")
# tclTaskSchedule(1000, test())
# Sys.sleep(2)
#
# ## Run ten times a task with a specified id
# test2 <- function () cat("==== Hello again from Tcl! ====\n")
# tclTaskSchedule(1000, test2(), id = "test2", redo = 10)
# Sys.sleep(1)
#
# ## Run a function with arguments (will be evaluated in global environment)
# test3 <- function (txt) cat(txt, "\n")
# msg <- "==== First message ===="
# tclTaskSchedule(1000, test3(msg), id = "test3", redo = TRUE)
# Sys.sleep(2)
# msg <- "==== Second message ===="
# Sys.sleep(2)
#
# ## Get info on pending tasks
# tclTaskGet() # List all (non hidden) tasks
# tclTaskGet("test2")
# ## List all active Tcl timers
# tclAfterInfo()
#
# ## Change a task (run 'test3' only once more, after 60 sec)
# tclTaskChange("test3", wait = 60000, redo = 1)
# Sys.sleep(1)
# ## ... but don't wait so long and force running 'test3' right now
# tclTaskRun("test3")
#
# Sys.sleep(3)
# ## finally, delete all pending tasks
# tclTaskDelete(NULL)
# ## End(Not run)
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