You have to close the dvd, or it will only play on the computer it was made on.
Sorry, I don't understand.
In cd/dvd burner software is usually an option to close the session, but its still writable. On such a disc it can only be read/played by the machine it was made on. This option is typically the default. Of course, that various by the software.
Also there is an option to close the session and the cd/dvd. Unless you close the cd/dvd, it will only be readable by the machine it was created/files saved on.
This is typically, but could be somewhere else in the program, in the 'details button' section of the burner software.