Yes and No. On one hand, ENVI-met is a “normal” Windows program, on the other hand, it has system requirements that other programs do not have. You might experience trouble that you don't have with other programs just because of bad resource management.

Also, ENVI-met constantly reads from and writes to the memory. Just one wrong value (e.g. a temperature of -9999 degree) can kill the whole simulation run. In other pieces of software you might only realize a short non-logical behavior…

ENVI-met will grab all the CPU power it can get. But it does not force Windows to give him all the CPU power, so you can switch to other applications if you have enough memory. On Windows NT systems, don't set ENVI-met to the highest priority because you won't be able to do anything after pressing the start button.