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I'm writing a screensaver, and checked for the parameter /c to see if the screensaver has to be started, or the settings windows should be shown.

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I found that the actual parameter passed is /c followed by a number, i.c. 3805726, the full argument is 

/c:3805726

What does this number mean?

Joris Groosman
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    try asking in "the old new thing" blog. But please present a VERBATIM command line, because from your current description the switch and number seem to be totally unrelated. Personally I would try to look into all windows on the desktop to see if it match some handle and use process explorer to see if it matches handle to some registry key or file or folder – Arioch 'The Dec 17 '15 at 11:24
  • that's why I downvoted the question and upvoted the answer which fully reflect the documentation. The qustion states "*`/c` followed by a number*" but in the comment below is followed by a colon: the full cmd line would be indeed appreciated – fantaghirocco Dec 17 '15 at 11:36
  • @fantaghirocco I clarified my question – Joris Groosman Dec 17 '15 at 11:46
  • @fanta - The gist of the question is that there's a number OP want explained. Upvoted to cancel the downvote. – stevenvh Dec 17 '15 at 11:49
  • @stevenvh I've already removed the downvote and I've understood the q :D Thank you – fantaghirocco Dec 17 '15 at 11:53

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If the /c parameter does not specify a number, the screensaver is expected to display its configuration dialog modal to the HWND returned by GetForegroundWindow() (the "Screen Saver Settings" window).

If the /c parameter specifies a number (either in /c:### or /c ### format), the number represents an HWND (similar to the /p parameter) that the screensaver is expected to display its configuration dialog modal to. On my Win7 machine, that HWND contains the contents of the "Screen Saver" tab on the "Screen Saver Settings" window.

Remy Lebeau
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