1. Yes. Accountant is accessing the tally which is installed on a different pc and he is logging in. I am unsure how it works , but at any given time only one user can log into tally on lan. Since i can give access to server to accountant , we have installed tally on a pc and he is accessing it.
2. Will try proxmox .. let me get to know about it. sounds interesting.
3. Cant afford it , since usage is very minimal. I am using google docs , but i want something local.
4. will look into it.