Simplify the following text for a Grade 10 native English-speaking person.
Original: They often use MSDOS , Linux , NetBSD , or an embedded real-time operating system such as MicroC\/OS-II , QNX or VxWorks .
Simplified: These often use DOS , Linux , NetBSD , or an embedded real-time operating system such as MicroC\/OS-II , QNX or VxWorks .