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I'm trying to get an ampersand to appear in the tray's tooltip. Here's my simple testing script:
I have tried these:

TrayTip:="a&b" — result is ab
TrayTip:="a&&b" — result is ab
TrayTip:="a`&b" — result is ab
TrayTip:="a^&b" — result is a^b
TrayTip:="a{&}b" — result is a{}b

I'm fresh out of ideas for the esacpe character(s). Thanks, Joe

TrayTip:="a&&&b"

Sure enough! Thanks much!

There's an explanation on StackOverflow: http://stackoverflow.com/a/10276283/894589

(AutoHotkey's ToolTip command uses TTS_NOPREFIX, so ampersands work there.)

Ah, that explains it nicely! I had a sense it was menu-related when "a&&b" resulted in "ab", but didn't understand why until that comment. Thanks!

I think there's a further bit of explanation missing: the person who designed it didn't know what they were doing.

Personally, I think it would have made much more sense to replace a&b with ab and leave a&&b as is - i.e. remove the underline but otherwise leave the final display text as is. With the current behaviour, I suppose a menu item a && b which displays as "a & b" would display as "a b" in a tooltip, which would obviously be incorrect.

Stripping the first & regardless of what follows it would make sense if the tooltip used TTS_NOPREFIX, since that would convert a&&b to a&b, which would then display correctly. But the system doesn't strip any ampersands if you use TTS_NOPREFIX...

I think it would have made much more sense to replace a&b with ab and leave a&&b as is

Agreed!