I have done a full compatible Virtual Com Port Driver. In final stage of
development I try to connect serenum.sys for pnp support. As I see in debug
of serenum : it gets pnp string from modem right and then adds AttachedPdo
to DEVICE_RELETIONS structure. But nothing happends : no new device, no enum
string in registry. And what is interesting - this GET_RELETIONS request
does not come to my vitual com driver, byt without serenum above I get it

May be somebody nows the secret, thanks for help