IupUser
Creates a user element in IUP, which is not associated to any interface element. It is used to map an external element to a IUP element. Its use is restricted and is usually done by CPI elements.
Parameters/Return
Ihandle* IupUser(void); [in C] [There is no equivalent in IupLua] [There is no equivalent in LED]This function returns the identifier of the created element, or NULL if an error occurs.