<a href="admin.php?page=minecraft-admin?mc=commands&p=restart">
    <?php _e( 'restart', 'minecraft-admin'); ?>
</a>
<a href="admin.php?page=minecraft-admin?mc=commands&p=start">
    <?php _e( 'start', 'minecraft-admin'); ?>
</a>
<a href="admin.php?page=minecraft-admin?mc=commands&p=stop">
    <?php _e( 'stop', 'minecraft-admin'); ?>
</a>
<br />
<form action="admin.php?page=minecraft-admin?mc=commands" method="POST">
    <input type="text" name="p" />
    <input type="submit" value="<?php  _e('send', 'minecraft-admin'); ?>" />
</form>
<br />