Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 226)

Using Parameter Editor MN/22156, rev 12
4-8 VMS User Guide
OK and Cancel buttons do not apply to any single dialog, but apply to
all dialogs in the Parameter Editor.
Because the Parameter Editor closes after a save operation, it is recommended
that all desired changes be input prior to clicking on the OK button.