[DJDhan]

Have a variables to store whether a player is registered or logged-in like so:

Code:

IsRegistered[MAX_PLAYERS];
IsLoggedIn[MAX_PLAYERS];

When he registers,

Code:

IsRegistered[playerid]=1;

When he connects, check if he is registered and then tell him to log in.

When he logs-in

Code:

IsLoggedIn[playerid]=1;

When he disconnects

Code:

IsLoggedIn[playerid]=0;

And write the IsRegistered variable to his file.