PC Access comes in two major versions:
Agent: The Agent version is for agents to purchase and use individually, such as from their home office or a portable computer.
Office/Broker version: The Office/Broker version has features to authorize multiple agents in an office to use one copy of PC Access. Only one agent may use PC Access at one time.
The Office/Broker version requires one person at each office to be the System Administrator. The System Administrator will usually be the Office Manager, or someone the Office Manager appoints. Ideally, the System Administrator should be knowledgeable about computers.
More:
System Administrator Responsibilities
Becoming the System Administrator