Only supported on some platforms . . .

[Richmond Mathewson]

This would be really very useful:

SUPPORTED property

put the SUPPORTED of XXX

where XXX is a function, command or property
and SUPPORTED consists of 4 comma-separated integers between zero and 1
where the first is for MAC OS X,
      the second for MAC 7,8,9
      the third for Windows,
      the fourth for Linux, UNIX

so:

put the supported of "hide taskbar"

yields

0,0,1,0

sincerely, Richmond Mathewson.
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A Thorn in the flesh is better than a failed Systems Development Life Cycle.
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