Any thoughts on exec: URL?

[email protected]
Mon, 8 Mar 93 09:37:59 -0500

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?