If you wish to retain your highlighted selection after viewing/editing a record and closing the Input form, the following code will help accomplish this:

COPY NAMED SELECTION(Current form table->;"orgsel")
GET HIGHLIGHTED RECORDS(Current form table->;"highlighted")
USE SET("userset") ` This reduces the selection to the highlighted records for editing...
MODIFY RECORD([Table 1])
USE NAMED SELECTION("orgsel")
CLEAR NAMED SELECTION("orgsel")
HIGHLIGHT RECORDS(Current form table->;"highlighted")
CLEAR SET("highlighted")

This code is suitable to put behind a button.