The LMC consists of a walled mailroom, consisting of a series of 100 mailboxes. Each mailbox is numbered with an address ranging from 00 to 99. The mailroom is located at the top-right corner of the Little Man Computer and is labeled 'Mailboxes'.

There is a calculator that can be used to enter and temporarily hold numbers, and also to add and subtract. The calculator display is four characters wide as opposed to three digits for the original LMC. This is to facilitate negative numbers. The calculator can hold values from -999 to 999. The user can change the contents of the calculator only by using instructions written for LMC.

Next, there is a two digit hand counter that holds the current mail box address that the little man is operating upon. This counter can be reset by the user by clicking on the button, Reset HC.

The computer also has an input and output basket that is used for inputting data to the LMC and outputting data from the LMC. The user can add input to the input basket by entering the data in the text field provided under the LMC and clicking on Add. The user can remove the data from the input basket by selecting the data that he wants to remove and clicking on remove. The user can change the contents of the output basket only from within the program.

The program status field located at the bottom of the screen displays the status of the Little Man Computer.

The user can key in the input program in the area marked as source program and get the related opcodes by clicking on the  'Get Opcode' button.

All the standard fields of the original LMC are bounded by an area marked as LMC. All the remaining fields on the screen are used by the user only for editing and executing purposes.