[pmwiki-users] Detecting if page is on a wiki trail

[Simon]

I want to be able to display a trail
(say in a group header)
only if a page is 'in' the trail.

Does anyone know of any way I could say
(: if ThisPage is in the trail WikiTrailPage :)
<< WikiTrailPage >>
(: ifend :)

thnaks in advance

Simon