Range
A range is just a series of lines defined by a starting line number, a slash (/) and an ending line number. ALL is short for FIRST/LAST and @ is short for ALL. If the ending line is left off, Qedit assumes LAST. You can shorten a range like 516/516.554 to 516/.554.
/a 20=100/120 {copy range 100/120 after line 20}
/c "X"Y" */200 {change X to Y in current line to 200}
/delete all {delete the range ALL}
/keep tF3 [/200 {write the range [/200 to a file}
/list 100/ {list the range 100 to LAST}
/m 1111/.99 {modify the range 1111/1111.99}
/list last-10/ {list the last 11 lines in the file}
/l @ {list the entire workfile}
/zz 5/10;l zz {mark a range, then list it}