The current Old School RuneScape metagame is pretty heavily dependant on the use of alt accounts. Efficient skilling needs a lot of money, and it's a waste of time to do money makers on your main account if you could be making money on an alt at the same time. RuneLite, the most popular client, does not support multiple profiles for having persistent settings for different accounts.

Thankfully, those using a decent operating system (i.e. Linux) can get around this pretty easily.

If (like me) you're after your OSCP and thus enrolling in the PwK course, you're given a Kali Linux VM to use in VMware format (vmdk).

If (like me) you prefer to keep all your virt open source and already run other VMs with qemu/KVM/libvirt, then we'll need to do something about that.