The Switch command allows you to set lots of different options for a user entering values. In this example I have set this up for dialling telephone numbers
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I have made an object called telephone and added a Verb called Dial:

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I then add a Print Message Script to the Verb to give a message with clear instructions:

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Next Add the verb to the Display verbs:

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Next I add a Command to the Room. The reason I do this is because I can “Dial” the number any time at all.
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I click on Room and then press Add and Command:

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In the empty box below I type in Dial #text#

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This means Dial followed by whatever number you want to add in (the variable) eg Dial 999
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Move down to Script and choose the Switch… command and type in the variable name “text” in the line:

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In the Cases box I click Add and enter the first number you want to dial eg:

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Click OK and select Print a message:

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Type in the message you want to have when you type in “999”

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Close the message to save it:

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Repeat this for lots of different numbers eg

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When you are finished, click Default and choose Print a message and write something like:

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This means that any number not on the list will get this message.
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Here is the final list:

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Here is how it looks with different options in action:
