Possible to update the internal note on appointment from imbedded webpanel?

Is it possible to have a webpanel where the user select different settings, and when they press a button on this impedded webpanel, some text is added to the internal note on the appointment the user have open.

Simple example

1) Open new appointment
1a) It could be an existing apointment
2) A gui webpanel/web tab on the (now open) appointment show a webpage where the user can select "Option A" or "Option B"
3) User select "Option A"
4) User press a button on the webpage
5) The text "Option A" is now added to the current appointment under "internal note"
6) User press save on the appointment

The imbedded webpage is generated via CRMScript (and %EJSCRIPT_START%, %EJSCRIPT_END% posibility)