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In MicroStation, you can use the "Select All" tool to select all elements in the current model. Here's how you can do it with a key-in:

1. Open the MicroStation file that you want to work with.

2. Press the "Ctrl" and "F" keys on your keyboard at the same time to open the "Key-in" dialog box.

3. In the "Key-in" dialog box, type the following command: SELECT ALL

4. Press the "Enter" key on your keyboard to execute the command.

5. All elements in the current model will now be selected.

Note that this key-in command will select all elements in the model, regardless of their level or other properties. If you want to select only specific elements, you can use other key-in commands or select tools to refine your selection.

In MicroStation, "Select All" and "Choose All" are two different key-in commands that have slightly different behaviors.

• Select All: This key-in command selects all elements in the current model regardless of their level or other properties. This command is useful when you want to select all elements in the model to perform an operation on them.

• Choose All: This key-in command selects all elements that meet certain criteria, such as elements on a specific level or elements with a specific color. This command is useful when you want to select a subset of elements in the model based on their properties.

For example, if you have a drawing with elements on multiple levels, you can use "Select All" to select all elements in the drawing, regardless of their level. However, if you only want to select elements on a specific level, you can use "Choose All" and specify the level name as the selection criteria.

In summary, "Select All" selects all elements in the model, while "Choose All" selects a subset of elements based on specific criteria.

No, you cannot use the <ctrl-a> key combination from the command line in MicroStation to select all elements. The <ctrl-a> key combination is a shortcut that is typically used in the graphics area to select all elements. However, you can use the "Select All" key-in command from the command line to achieve the same result.

To use the "Select All" key-in command from the command line, you can follow these steps:

1. Press the "Ctrl" and "F" keys on your keyboard to open the Key-in dialog box.

2. In the Key-in dialog box, type "SELECT ALL" (without the quotes) and press Enter.

3. All elements in the active model will be selected.

Alternatively, you can create a custom function key that executes the "Select All" key-in command. To do this, follow these steps:

1. Go to the Workspace menu and select Function Keys.

2. Click the New button to create a new function key.

3. In the Key-in field, type "SELECT ALL" (without the quotes).

4. Click OK to save the new function key.

Now, you can use the assigned function key to select all elements in the active model.