Is the plaster flat? not textured? That will make it easier.
Is it a straight crack? like a seam over a floor joist above?
That would make it seem more likely it might need to be taped over to keep it from appearing again.
Software is often divided into two categories:
# systems software : Includes the operating system and all the utilities that enable the computer to function.
# applications software : Includes programs that do real work for users.