Any thoughts on exec: URL?

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From: joe@athena.mit.edu
Date: Mon, 8 Mar 93 09:37:59 -0500
Message-id: <9303081437.AA21416@theodore-sturgeon>
To: www-talk@nxoc01.cern.ch, tk-WWW@athena.mit.edu
Subject: Any thoughts on exec: URL?

In the next version of tkWWW, I'm planning to include an "exec:" URL
header.  If you select a tag with this header it will display the text
at the end of the address and ask the user if it wants to execute it
as a system call.

Any thoughts?  In particular, are there any security problems won't be
fixed by asking the user whether or not to execute the command before
doing so?