Can someone explain GUI Dummy controls to me?

[MrTWist]

I'm trying to implement a GUI slider as a way to control audio playback and have been looking over the examples, some of which make use of "dummy" controls.

It's not apparent to me why dummy controls are used. Would someone be so kind as to explain dummy controls?

Ultimately, I'd like to have a label display the audio track elapsed play time while the slider creeps along.

Thank you in advance....

[PhoenixXL]

The controls which are of no requirement to the control but are useful for the GUI to send or receive specific events/Messages are known as Dummy Controls

Edited June 8, 2012 by PhoenixXL

[Zedna]

It can be used to avoid blocking code in message loop/events

http://www.autoitscript.com/wiki/GUIRegisterMsg