A note for those (including myself) who try to use a GUI module in their code:
When a module's init function is called, it will not block until the module is unloaded.
The init function will just return immediately and the caller's draw and keyboard callbacks will only be called again once the called module exits.
So, the following code is not suitable for enforcing limits on 'demo_var':
libhexbox->hexbox_init( (int*)&demo_var, "Demo variable, enter 0-9", 0 );
if (demo_var > 9)
demo_var = 9;
