I am developing a program's GUI and have been using GTK heavily. However, I have run into some trouble...

I need to use gtk_signal_disconnect yet I have been having trouble finding a webpage that describes handler_id. Please help.

I am not sure what kind of trouble you have. Handler id is an opaque value returned when the signal was connected:

id = gtk_signal_connect(obj, name, func, data);
...
gtk_signal_disconnect(obj, id);
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