Actually I disagree... PICs can multitask...

... from another thread (to paraphrase a quote from BattleStar Galactica "all of this has happened before and will be again")...

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Usually you need multiple or parallel processors to do multitasking. Most computers give the illusion of multitasking through a process of time-slicing - ie devoting a portion of the overall CPU time to a given job, then switching to another task. If done fast enough then you have your multi-tasking illusion (typical example is Microsoft Windows).

Actually PICs do genuinely multitask quite well. They're able to sample an ADC channel, perform multiple Timer functions, execute PWM trains, catch data in the USART and perform Analogue Comparisons all genuinely simultaneously whilst your program is doing something completely different. It's called using the features provided within your PIC and the secrets of exploiting these multitasking features are... in the Datasheet.