Business and Dealings

Using one's work computer for personal work if one has free time

Q: I am a government employee. I work on the computer. Often, there is little work and most of the time we are free. My questions are: 

1. Can I use the Govt. computer and internet for further learning advanced technologies?

2. Can I use it for listening to Islamic lectures?

3. Can I use it for work with some other companies as most the time I have no work to do?

Furthermore, the internet service is free and does not incur extra charges.