Combines a base and relative URL into a single URL. Returns the
(canonicalized) combined URL or <A HREF="../../../lib/Pod/perlfunc.html#item_undef"><CODE>undef</CODE></A> on errors. For the possible
values of <EM>flags</EM>, refer to the <A HREF="#microsoft win32 internet functions">Microsoft Win32 Internet Functions</A> document. See also <CODE>CombineURL</CODE> and <CODE>OpenURL</CODE>.
<P>If you don't specify a <EM>flags</EM> parameter, ICU_ESCAPE will be used by
default; for the possible values of <EM>flags</EM> refer to the <A HREF="#microsoft win32 internet functions">Microsoft Win32 Internet Functions</A> documentation. See also <CODE>CreateURL</CODE>.</P>
Returns information about the progress of the asynchronous operation
identified by <EM>context</EM>; those informations consist of two values: a
status code (one of the INTERNET_STATUS_* <A HREF="#constants">Constants</A>) and an
additional value depending on the status code; for example, if the
status code returned is INTERNET_STATUS_HANDLE_CREATED, the second
value will hold the handle just created. For more informations on
those values, please refer to the <A HREF="#microsoft win32 internet functions">Microsoft Win32 Internet Functions</A> documentation. See also <A HREF="#item_SetStatusCallback"><CODE>SetStatusCallback</CODE></A>.