touch screen event detection

Is there any special function to deal with touch screens?
The generic event handler below stops most of the time signalling move events while one finger is already on the screen.
Detecting two fingers ( 'alt-down') is nearly impossible.

rebol []

reb-ver: rebol/version
tst-ver: "2.7.7.3.1"



view layout/size [
do [
event-handler: insert-event-func [
print [event/type ": " event/offset]
if equal? event/type 'close [
remove-event-func :event-handler
]
return event
]
]

] 800x600