But the idea is report those local users to the HF via the main station. even if they don't connect for days. Like the heared station report. Im not sure how many time a station is reporting heared stations.

I have read: We can use two instances of varac one in hf and another in vhf but some users not are active all the day or weekends. but the idea is report those users to the hf via the main station who is active full time. This is because one user not always is a person, it can be a entity with callsign who opens on office times and use local radios like vhf uhf.

The idea is: If we have an association with multiple persons associated who their works only in VHF or UHF in local. As an example is: a user have a node on one van and works in portable in vhf. Another user is an boat and use his vhf to download and send messages via the main local station or the association station. Another user for example is the local rescue station who have his callsign and use vhf to receive and send messages via the main station association. The main station association is a HF who can send messages in local and overseas. The main station reports those callsigns in HF and receive and store the messages for the local stations. 73's

Maybe two functions on Vara modem for users. 1-Register to a remote station 2-Unregister to a remote station Only if the remote station is a radio club and has te radio club vara modem versión. The user has the option to register to a radio club and receive messages from the radio club. One member always can use the radio and antennas of the radio club for make calls. Ok if i can understand you say VarAC can't handle messages for different users at the same time...

Ok. Maybe this is a Vara modem side implementation in first but users connecting to main stations with his vara modems to download or receive his saved messages.

When the identification is sent, the Varac can identify all the users in the club to receive messages about them. you know. This is not a good idea to implement unless the license is actually from a radio club or association with multiple users who can receive messages on their offduty time under the main station.