You may try to figure out how the original form can be started -- find an executable or a DLL module to be invoked.

For example:
Winexec('rundll rnaui.dll,RnaDial [Connection Name]',SW_NORMAL)

or
RUN 'rundll rnaui.dll,RnaDial [Connection Name]'

In your particular case certainly it would not be maui.dll but something else.