In Windows, Tcl/Tk programs running under the tcltk package can update too frequently: for exmaple, we might go through a long sequence of operations to construct a complex display, and in Windows each addition will be shown separately.
To work around this, I've added a function "tclServiceMode" which serves as an R interface to the "Tcl_SetServiceMode" function in the TCL API. Calling "tclServiceMode(on = FALSE)" will stop Tcl/Tk from responding to any events (redraws in particular) until "tclServiceMode(on = TRUE)" is called. As far as I know, events are queued, not lost, when handling is turned off.
So far this function is only in R-devel, but I'll commit it to R-patched the next chance I get.
Duncan Murdoch
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