Adam,
        thanks for your reply. I'm not sure if I understand your suggestion. 
At this stage I have a derived dialog class (SprTimingDialog : public 
TDialog) And certainly I can declare and define a response table for it. The 
difficulty is that I need a message that is sent when the dialog finishes 
construction so that I can handle it. While documentation mentions about 100 
Ev_Wm_XXXXX windows messages very little is said about when and where they 
are sent from. (I'm not sure that I understand the process - if there is not 
some exogenous sending of a Dlg_Construct_Completed message, perhaps I could 
send one of my own from SetUpWindow() ??)
        Perhaps there are also messages sent from TDialog or from another 
ancestor. Do you know of any such messages?
                        best regards,
                                Steve. :-[
- sorry that sounds dreadfully confused
PS I've solved the problem of termination of the GetTime function. I can just 
set a flag (ContinueSendingTime = FALSE) in CmOK() and CmCANCEL()
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