1) Like a mailroom job 2) Not at all advanced 3) Relatively unimportant 
A form of programming used by languages such as C/++ and assembly to access the hardware directly.
this is an expression taken from Rudolph Labans division of space. It is used to talk about movements executed in positions like lying or movements like cringing and rolling on the floor (see High Level and Middle Level too).
[adj] - at a low level in rank or importance 2. [adj] - not intense 3. [adj] - occurring at a relatively low altitude
low-altitude adjective occurring at a relatively low altitude; `a low-level strafing run`
undertaken by or composed of members having a low status: a low-level discussion. · having low status: low-level personnel. · undertaken at or from a low altitude: low-level bombing. · occurring or operating at the phonetic level of linguistic representation or analysis: low-level rules governing assimilation.