Thank you for help,
Actually event processing is quite okay in Win32::OLE module, although it is in alpha state. (as perldoc Win32::OLE says), so I was dreaming about a possibility to send not only standard event, but some kind of my own notification.

One way exists to solve my task for sure, but it is too complicated, and I am afraid of implementing it.
Idea is to use PerlScript engine from MS-Word to communicate my initial script via, say, "PostThreadMessage" or alike. (PerlScript from ActiveState was mentioned somewhere at this site)
but I really afraid of such complications: there should be too much conditions to be met in order to run a program, one of them - perl-5.8.0 will not be able to do that currently, as it is not PerlScript-aware, AFAIK.

Courage, the Cowardly Dog