I sounds like he intends to buy a dongle (the first and only one) so he can transfer the soft license onto it. Then, he could run it on both, just not at the same time.
Of course, I could be misunderstanding.
XPS 17 Core-i7 2820QM, 16GB RAM. Cubase 6.5.5 x64 on Windows 7. Cubase 7.5 Trial. Scarlett 2i2. M-Audio Axiom Pro 61. Komplete 8. HALion 5. Jamstix 3.5. HSO VST Sound Set. Absolute VST+. 418 Carrier Landings.