Add some colors to your source:

Here's a tip many people may not be aware of. When we are coding the programs we put a lot of comments to explain logic or functionality, instead of putting these comments in green color, generally we will prefer to put them in different colors. We can add some colors to our program by using simple Client Access keyboard mapping.
o Click on the "MAP" button.
o Click on any key, for example I want to map my ALT + R for red color.
o So click on R and type APL 28 in the box provided against Alt and save the settings.
o Now go to the source line, which you want to make in RED. Put your cursor just before the first word of the line and press ALT + R and enter, the source line will be displayed red in color.
By using this technique we can change the colors for member text too. Take option 13 and F4 for member you want to change the color first, then put your cursor just before the first letter in the text and press corresponding color key and press enter. Now you can see your member text will be displayed in different color.
For different colors follow this table:
APL 20 - Green
APL 21 - Green RI
APL 22 - White
APL 23 - White RI
APL 24 - Green UL
APL 25 - Green RI UL
APL 26 - White UL
APL 27 - ND
APL 28 - Red
APL 29 - Red RI
APL 30 - Turquoise
APL 31 - Turquoise RI
APL 32 - Yellow
APL 33 - Yellow RI
APL 34 - Turquoise UL
APL 35 - Turquoise UL RI
APL 36 - Yellow UL
APL 38 – Pink
APL 39 – Pink RI
APL 3a – Blue
APL 3b - Blue RI
APL 3c – Pink UL
APL 3d – Pink UL RI
APL 3e – Blue UL
APL 2a – Red Blinking
APL 2b – Red RI Blinking
APL 2c – Red UL
APL 2d – Red UL RI
APL 2e – Red UL Blinking