Hey there :wave: !
I'll try to make it simple. Someone correct me if I am wrong.
- IDDs can be used to define the type of dialog you want to create. They are crucial in resource.cpps mainly, not so much in description.exts.
- IDCs are numbers which define the identities of the various components of one same dialog. In many dialogs, values or texts are changed by using the command "CtrlSetText". You choose what component of the dialog you want to modify by selecting the corresponding IDC.
I hope this is clear enough and you get the general idea, I find dialogs way easier to manipulate than to explain.
Ig.