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Wolfgang Orth had a webgem on easing permissions for files used across the network using Internet Explorer, but I missed part of that. Perhaps someone can fill this in.
INRANGE
Some discussion of the Inrange function.
STATUS
Greg Bailey brought up the STATUS function, which among other things can be used to get the open mode of files (or whether the file is open at all). Mark Goldberg pointed out that there is a BadWindow equate but it's not clear when this might come into play. The online help has the following code in no particular context:
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Mike Hanson and Mark Goldberg continued with a previous project - a general purpose progress bar that could function as a drop-in replacement for the standard progress bar with some improvements, such as only displaying if the progress elapsed time exceeds a certain value. Lots of nice techie code in there. I missed the first part (or parts) so I'm still a bit adrift as far as how this class actually works.
One snag - there are potential problems with having a window definition stored with the class. If you attempt to open two instances of the class you'll get a GPF because you can't open the exact same window instance twice. So Mike switched to requiring an Init method to set up references to an existing window (and he put the class's window definition in an include so it can still be used).